scope function kotlin difference

The best ways to obtain a standalone instance of the scope are CoroutineScope and MainScope factory functions. When as a Expression . Let's inspect its signature: Defined as an extension on T, the receiver/context object; Returns the receiver object T; block argument with regular function type (T) -> Unit; Receiver T is passed as argument to block Scope functions allow you to create a temporary scope for an object. The object is then accessible in that temporary scope without using the name. * public interface Function1 : Function { public operator fun invoke(p1: P1): R } When there is no return type defined within the Kotlin code, then the lambda returns a Kotlin Unit. It does not simply setting properties of course but do much more functionalities and capable of evaluating complex logic before returning. The also function takes a lambda in which you refer to the object you called the function on (receiver T) with either it (implicit name) or a custom name. The Kotlin code for the loadImage extension function you wrote looks like this: fun ImageView.loadImage(imageUrl: String) { Glide.with(this) .load(imageUrl) .into(this) } Look at the decompiled code and you’ll notice that it’s a static function that takes the receiver class of extension function as its first parameter. In Kotlin, scope functions allow you to execute a function, i.e. Another big confusion is between function and method.Difference is following: Method is a function associated to an object.. Function is a more general term, and all methods are also functions.What are methods then? What are the differences between them? To use coroutines in Kotlin, you need three things: A job; A dispatcher; A scope Take a break Way 3— Create a class extending the function type and pass the instance of your class Example 1. interface CustomFunctionType : -> Unit {override fun invoke()}Here, we created an interface that extends a function type. At the Kotlin Everywhere event held in Buenos Aires last September, Google Expert Carlos Muñoz gave an amazing talk about how certain Kotlin features translate to bytecode. As you can see, it is very similar to apply. You might have seen these before and wondered what the difference between them is. The scope defines the accessibility of any variables. Scopes help to predict the lifecycle of the coroutines. Choosing the right scope function in Kotlin. run Takes an expression which is a piece of code, and executes it. Kotlin brings in a bunch of developer-friendly features for less code thereby resulting in fewer bugs. Most likely, you're already familiar with lambda arguments. The difference is, that we have to pass the context, and insteed of Toast(this), we can just use this and call on it the apply scope function. the variables declared in the outer scope. One of the small but loved is the scoped functions. So for example: Inside the scope of .apply, whenever we refer to a variable of the Card object, we actually do not need to reference the Card object directly. A coroutine is a piece of work that is concurrent with the rest of your code and its launch has to be explicit ² . Kotlin has many wonderful features that make Android programming much nicer – coroutines, extension functions, higher order functions, typealiases – the list goes on. … with is used to change instance properties without the need to call dot operator over the reference every time.. Function in functions. Scope functions is one of the Kotlin feature I really like. For example like this: coroutineScope.launch {flowOf(1, 2, 3).collect { println(it) }} whereas .launchIn() can be called like this in any regular function: flowOf(1, 2, 3).onEach { println(it) }.launchIn(coroutineScope) Kotlin is not only useful for new applications, but its files can come co-existence with Java files – that means there’s scope for existing applications too. In here, we need to access both the data variable from myIntent, and data variable from MainActivity. Choosing the right scope function in Kotlin. Think "also, please log this variable". Tagged Kotlin. Functions are nothing but kotlin code written under a block to perform a task whenever user want to perform by making a call to this block of code, and this block of code is called as function in kotlin. Simply put, a mutation function operates on the given object and returns it. If the variable is mutable, then you should definitely use ?.let to guarantee that everything inside the scope function is null safe. I will explain with an example. A suspend function may run on a background thread, or on the main thread. The type being extended, which is available in the lambda as the context object this, is called the lambda receiver. The way in which the object is referenced inside this new scope is as follows: Inside a scope function, you will be able to reference the context object by a short word (this), instead of the name itself. run Takes an expression which is a piece of code, and executes it. No need to panic, this should be super efficient and optimized by the compiler. Although whatever you do with scope functions can be done without, they enable you to structure your code differently. 1. For newcomers to Kotlin, the scope functions can be hard to wrap your head around. Defines a scope for new coroutines. The above definition is equal to having a function : Function vs method. Kotlin works in a serial fashion, meaning that a function cannot move forward if it relies on another function to give it some signal or data. Defines a scope for new coroutines. This is similar to our raffle example, where the goal is keeping a minimalist outer scope, using the let function. Cheers! So, the code looke like below. They're mostly different in two ways: What is a lambda receiver? … Kotlin supports functional programming. Kotlin scope and extension functions: when to use and how to improve not harm the readability ... kind of scope function called use that's 14:28 basically Chavez ... don't think there is a difference in Extension functions defined in a kotlin file could be used any where in the project, we can call this global scope.On the other hand, the extension functions defined inside a class can only be called from the scope … So the code we write can have a very clean API: But how would you write a function like buildString? The return type of both the function type parameter and the scope function itself are same: R. The return type R is generic. In this scope, … 13. In the preceding code snippet, you are ensuring that the settings property is not null inside the run function scope and you can access it with the this keyword. So, with that knowledge we can approach scope functions knowing they are higher order functions provided by the Kotlin standard library just like repeat. Actually, in this last example, we are missing the whole point of using scope functions. Kotlin extension functions can be defined in a kotlin file or as a member of a class. They should make our code easier to read and understand, but this is making our lives much more complicated. The object they're accessing can be available as a lambda receiver (. The Kotlin code for the loadImage extension function you wrote looks like this: fun ImageView.loadImage(imageUrl: String) { Glide.with(this) .load(imageUrl) .into(this) } Look at the decompiled code and you’ll notice that it’s a static function that takes the receiver class of extension function as its first parameter. Surprisingly, the Scope Function alternative translates into more bytecode. The definition of this function is it accepts no parameter and returns Unit.. Identifier Extension Function The Object represented as Such functions are called Scope Functions I would really appreciate if you could let me know of any suggestions/feedback in the comments. A good example is the functional programming idiom foldfor collections, which takes an initial accumulator value and a combining function and builds its return value by consecutively combining current accumulator value with each collection element, replacing the accumulator: In the code above, the parameter combine has a function type (R, T) -> R, so it accepts a function that takes two arguments of types R and T and re… Well yes, you can, but we would be missing the whole point of using scope functions, improving readability. In today's discussion, we will learn what are the different scope functions in Kotlin help us to build concise code for our android app. What is Function in Kotlin ? The whole idea of the run scope function is to run a piece of code. To save user’s time for common tasks, Kotlin comes withsome standard library functions which do not need to be defined by users to use in the program. It can be demonstrated by the following example: Kotlin scope functions are very handy and make the code more readable. ... ALSO is similar to LET, only difference is, ALSO returns the object while LET won't. Also, are there some cases where one would work and the other won’t? One of them reaaally surprised me, see below: We have two functions with the same purpose, one of them using the let scope function, the other one using the classic (if !=null) check. Scope Functions The Kotlin standard library contains several functions whose sole purpose is to execute a block of code within the context of an object. The way in which the object is referenced inside this new scope is as follows: this. One of the small but loved is the scoped functions. You may ask yourself, can´t we log the info inside the apply function? Kotlin has many unique language features for someone coming from Java. Kotlin let. It is not an extension function. So, with that knowledge we can approach scope functions knowing they are higher order functions provided by the Kotlin standard library just like repeat. The function type parameter is the last parameter in the higher order function with. When should we use them? Library support for kotlin coroutines. Solution no. Kotlin scope functions are very handy and make the code more readable. let takes the object it is invoked upon as the parameter and returns the result of the lambda expression. I will explain with an example. Definitely all member functions and member property accessors are methods:. class A {fun someMethod() {}}In OOP, classes have members that … A lot of the times we can get away with putting all of those fields in a constructor, but the run function is still a good option. After all, you know that the variable is inmutable and will not change to null after the (if !=null) check. Similar to threads, coroutines can run in concurrently, wait for, and communicate with each other with the difference that creating them is … When as a Statement . Same example as before, but we also need to log additional info. A higher-order function is a function that takes functions as parameters, or returns a function. Note that run returns the last statement of the function. Basically, if you are initializing an object, and setting a bunch of properties like in this case, you have a pretty solid candidate to apply this scope function. When you call such a function on an object with a lambda expression provided, it forms a temporary scope. Primitive Data types ... No Automatic Conversion . Using infix function provides more readability to a function similar to other operators like in, is, as in Kotlin. Kotlin extension functions can be defined in a kotlin file or as a member of a class. The return value. Smart casting and using let are solid options that take good advantage of Kotlin's type system. Making code easier to read, more concise, and more efficient to write. When dealing with a nullable type, we have a few options. Is there any difference and should I use one over the other? In the above example, action is a lambda function, with the type of an extension function. The practical difference then is, that you can call collect() method only from another suspending function or from a coroutine. The main difference is that the runBlocking method blocks the current thread for waiting, while coroutineScope just suspends, releasing the underlying thread for other usages. How is it different from a lambda argument? A coroutine is a piece of work that is concurrent with the rest of your code and its launch has to be explicit ² . Good practice -> We should be able to remove the also scope function and not break any logic in our code. Kotlin let. Calling Kotlin Function from java and vice versa . Just take a look at how many variables are created in each function. So, enough of the introduction, now we are ready to talk about the different scope functions. Inside a scope function, you will be able to reference the context object by a short word (this), instead of the name itself. In this case, we have decided to put the variables cvv and cardHolder inside the run function, making them invisible from outside the scope function. The Java code must import the class from the kotlin … The inner function has access to all variables in the scope of the outer function. 1. Kotlin let is a scoping function wherein the variables declared inside the expression cannot be used outside. Here’s a list: let; also; with; run; apply When using such a function on an object, you are executing a block of code within the context of that object. For newcomers to Kotlin, the scope functions can be hard to wrap your head around. First, let’s take a look at the mutation functions also and apply.. Here’s a list: let; also; with; run; apply The return type can be either the object itself, or the result of the lambda function. The way in which the object is referenced inside this new scope is as follows: this. The Kotlin standard library offers another similar extension function, called apply(), which is useful for the initialization of objects. How to solve this issue? Kotlin supports functional programming. Similarly, sqrt() is a standard library function that is used to calculate the square root of the provided number. It is the only scope function that has two variants. What is Function in Kotlin ? Unlike Java where every function needs to be encapsulated inside a class, Kotlin functions can be defined at the top level in a source file. 2. run as function -> reduce the scope of certain variables, to avoid unnecessary access. The scope defines the accessibility of any variables. Don't use them just for the sake of using them, only do so in cases where it actually adds value and makes your code more readable.◾. That means, we can pass our function literal between curly braces as an argument after the with function call parentheses. a block of code, in the context of an object. If the thread is suspended, other work happens until the result is available. Input output . The best ways to obtain a standalone instance of the scope are CoroutineScope and MainScope factory functions. Difference Between Var and Val . We can access the variables cvv or bank directly. This may or may not return a value. Suspend Function In Kotlin Coroutines; Scope in Kotlin’s coroutines can be defined as the restrictions within which the Kotlin coroutines are being executed. It makes the scope in which the coroutine is launched opaque and implicit, capturing some outer Job to launch a new coroutine without explicitly announcing it in the function signature. In this scope, we can access the object without its name. The local function is only accessible within the outer function. 1. In Kotlin, scope functions allow to execute a function, i.e. The control flow shifts to the second function, giving it total power and the ability to hold an application hostage. 4. Print() is a common function that is used to show a message to the monitor. Its main purpose is to execute a block of code within the context of the object. These two scope functions are very similar, the difference being that run takes a lambda receiver (this), and let takes a lambda argument (it). An example demonstrating kotlin let function is given below. These two scope functions are very similar, the difference being that run takes a lambda receiver (this), and let takes a lambda argument (it). The scope functions all serve a similar purpose: to execute code on an object. There are five scope functions available in Kotlin: let, apply, run, with and also. When we call such a function on an object with a lambda expression provided, it forms a temporary scope. These two scope functions are very similar, the difference being that run takes a lambda receiver (this), and let takes a lambda argument (it). it now references myIntent, whilst this references the outer class, MainActivity. Functions are first-class citizens in the language.Unlike Java where every function needs to be encapsulated inside a class, Kotlin functions can be defined at the top level in a source file.In addition to top-level functions, you also have the ability to define member functions, local functions, and extension functions. Example: fun main(args: Array){ var number = 100 var result = Math.sqrt(number.toDouble()) print("The root of $number = $result") } Here sqrt() does not hav… Scope functions is one of the Kotlin feature I really like. 14. The Scope function is also similar to other functions with the difference that it takes on an object with a lambda expression which forms a temporary scope and we can access the object without its name. Scope functions. Let´s see how this translates to Kotlin bytecode: No need to understand what each line is doing here. If Else . Tip: The difference between blocking and suspending is that if a thread is blocked, no other work happens. Functions are first-class citizens in the language. with It is convenient when you have to call multiple different methods on the same object. To reference the object inside the scope function, we use the keyword it. The above definition is equal to having a function : Although whatever you do with scope functions can be done … However, as a good practice, if the variable that you are applying the scope function to is inmutable, maybe you could give a little help to the compiler and make the (if !=null) check yourself, instead of using the scope function. Which is the best coroutines way to run a native database query from android? You may even use them without knowing exactly the differences between them. If you have enough hands-on experience, you might be already using scope functions. The Kotlin standard library offers another similar extension function, called apply(), which is useful for the initialization of objects. Every coroutine builder (like launch, async, etc) is an extension on CoroutineScope and inherits its coroutineContext to automatically propagate all its elements and cancellation.. Which is the best coroutines way to run a native database query from android? So for example: The following is an example of the same: The following is an example of the same: var listOfMindOrks = listOf("mindorks.com", "blog.mindorks.com", "afteracademy.com") listOfMindOrks.forEach { Log.d(TAG,it) } Kotlin provides infix notation with which we can call a function with the class object without using a dot and parentheses across the parameter. Scope functions allow you to create a temporary scope for an object. Instead of repeating the variable containing this object on each line, you can use with. Less Code Means Less Bugs Among the bunch of developer-friendly features, Kotlin brings to us, “ scope functions ” is one of the most important. If you read some Kotlin code before you probably already seen them. Frankly, the scope functions require time to understand, especially for people who are tackling Kotlin for the first time. This is a normal function. In fact, I rarely use with since it doesn´t allow me to do a null check, whilst ?.apply does. The Kotlin standard library contains several functions and purpose of each is to execute a block of code within the given context. What is the difference between runBlocking vs scope.launch ? Mostly used for null checks, when applying ?.let on an object, we can rest safe that every time we access that object inside the scope function, the object will be not null. Every coroutine builder (like launch, async, etc) is an extension on CoroutineScope and inherits its coroutineContext to automatically propagate all its elements and cancellation.. In this video we talk about the run scope function and how I typically use it with Kotlin. a block of code, in the context of an object. The Kotlin standard library contains several functions whose sole purpose is to execute a block of code within the context of an object. It makes the scope in which the coroutine is launched opaque and implicit, capturing some outer Job to launch a new coroutine without explicitly announcing it in the function signature. But what is a lambda receiver? Scope functions allow you to create a temporary scope for an object. Compose (UI) beyond the UI (Part I): big changes, Greatest Android modularization mistake and how to undo it, Abstract & Test Rendering Logic of State in Android, The Quick Developers Guide to Migrate Their Apps to Android 11. Kotlin “scope functions” are functions that allow for changing the scope, or the range, of a variable. String Operation. Inside a scope function, you will be able to reference the context object by a short word (this), instead of the name itself. The following is an example of the same: The following is an example of the same: var listOfMindOrks = listOf("mindorks.com", "blog.mindorks.com", "afteracademy.com") listOfMindOrks.forEach { Log.d(TAG,it) } Can you trust time measurements in Profiler? Kotlin scope and extension functions: when to use and how to improve not harm the readability ... kind of scope function called use that's 14:28 basically Chavez ... don't think there is a difference in Classification Scope functions can be classified with 3 aspects. LET scope function. In today's discussion, we will learn what are the different scope functions in Kotlin help us to build concise code for our android app. A variable will be shadowed in case of same names of inner and outer variables. You won’t find a similar feature in Java. It doesn't handle the nullable type well—it just gives it an ultimatum. 1: TL;DR Difference. ... ALSO is similar to LET, only difference is, ALSO returns the object while LET won't. let takes the object it is invoked upon as the parameter and returns the result of the lambda expression. They're simply the argument of a lambda function. Take a break Way 3— Create a class extending the function type and pass the instance of your class Example 1. interface CustomFunctionType : -> Unit {override fun invoke()}Here, we created an interface that extends a function type. You may even use them without knowing exactly the differences between them. But today I wanted to talk about Scope Functions. ... can access its closure, i.e. Simple, by using the notation this@MainActivity.data. class MainActivity : AppCompatActivity() {, Building complex screens in a RecyclerView with Epoxy. Kotlin :: apply In Kotlin, apply is an extension function on a particular type and sets its scope to object on which apply is invoked.Apply runs on the object reference into the expression and also returns the object reference on completion. This article focuses on determining when you should consider refactoring your code and implementing the scope function in Kotlin, with helpful code and diagrams. The control flow shifts to the second function, giving it total power and the ability to hold an application hostage. 11. Hope the post was useful! The whole idea of the run scope function … You might have seen these before and wondered what the difference between them is. As we mentioned earlier, scope functions differ in two ways—the return type and how they access the object they're running code on. In Kotlin, to use the functionality of a for-each loop just like in Java, we use a forEach function. In the preceding code snippet, you are ensuring that the settings property is not null inside the run function scope and you can access it with the this keyword. also is the best-named scope function. LET scope function. If you read some Kotlin code before you probably already seen them. Only imports and declarations can exist at the top level of a Kotlin file. Kotlin provides the functionality to define function within the scope of functions. But today I wanted to talk about Scope Functions. The definition of this function is it accepts no parameter and returns Unit.. Prerequisite: Kotlin Coroutines on Android; Suspend Function In Kotlin Coroutines; As it is known that when the user calls the delay() function in any coroutine, it will not block the thread in which it is running, while the delay() function is called one can do some other operations like updating UI and many more things. It's an object available in a lambda function, as if the code were executing in a normal class. Tagged Kotlin. In the case of also, an extension method, we provide a lambda that operates on the extended object:. When using such a function on an object, you are executing a block of code within the context of that object. For newcomers to Kotlin, the scope functions can be hard to wrap your head around. Because of that difference, runBlocking is a regular function and coroutineScope is a suspending function. This article focuses on determining when you should consider refactoring your code and implementing the scope function in Kotlin, with helpful code and diagrams. Architecture of Kotlin . You won’t find a similar feature in Java. Why studio suggest that db query function's suspend keyword is not necessary and have to be removed (even though I run it inside a coroutine scope) ? Scope Functions do not introduce new technical capabilities, nor do they have a real impact on performance. There are five scope functions available in Kotlin: let, apply, run, with and also. Suspend Function In Kotlin Coroutines; Scope in Kotlin’s coroutines can be defined as the restrictions within which the Kotlin coroutines are being executed. The way to refer to the context object 2. Scopes help to predict the lifecycle of the coroutines. The Kotlin code is secure and more concise than Java code. The example could be read as: We use the apply function to initialize and configure an object, but we also need to log some additional info. With similar sounding names (let, run, apply, also, with), choosing the right one can be difficult. Why studio suggest that db query function's suspend keyword is not necessary and have to be removed (even though I run it inside a coroutine scope) ? Because the scope functions are all quite similar in nature, it's important to understand the differences between them. import kotlin.jvm.functions. Function types. I categorized scope functions, let, with, also, apply, run in Kotlin. The object is then accessible in that temporary scope without using the name. Extension functions defined in a kotlin file could be used any where in the project, we can call this global scope.On the other hand, the extension functions defined inside a class can only be called from the scope … In Kotlin, to use the functionality of a for-each loop just like in Java, we use a forEach function. Kotlin uses a family of function types like ... One other difference between lambda expressions and anonymous functions is the behavior of non-local returns. Its main purpose is to execute a block of code within the context of the object. Kotlin has come a long way, even though it is still in the early stages of version 1.2. Therefore, the main downside is making your code less approachable. There are two main differences between each scope function: 1. Doing a hard null-check, however, can result in a null pointer exception. What is the difference between runBlocking vs scope.launch ? I was quite unable to wrap my head around this concept, but trust me, once you get ahold of it, everything will start to make sense. The also function is the scope function that got lastly added to the Kotlin language, which happened in version 1.1. Itself are same: R. the return type can be available as a member of a class and the won! To access both the function dispatcher ; a scope import kotlin.jvm.functions let ’ s take a look how... Such a function on an object code, in the context object this, is called the lambda receiver is. To reference the object they 're accessing can be scope function kotlin difference in a receiver... On performance library contains several functions whose sole purpose is to execute code an. The square root of the lambda expression in this last example, action is a piece work! Best coroutines way to run a native database query from android rest of your code less approachable and understand but... Kotlin let function operator over the reference every time whilst this references the outer,! Runblocking is a function with the rest of your code and its launch has to be explicit ² similar. Native database query from android same example as before, but we would be missing the whole of. Are solid options that take good advantage of Kotlin 's type system main purpose is to execute block! Are there some cases where one would work and the scope function: 1 without its name type system won! Infix function provides more readability to a function on an object top level of a Kotlin file the... Is invoked upon as the parameter is making our lives much more complicated, called (... Message to the Kotlin language, which is available you do with scope functions be... Data from MainActivity, especially for people who are tackling Kotlin for the first time in the... And the ability to hold an application hostage what the difference between blocking and suspending that... Earlier, scope functions allow you to structure your code and its launch to. Of code, and executes it be defined in a RecyclerView with Epoxy last example we. Instance properties without the need to access both the data variable from myIntent, and it. Provided number instance of the object without its name: library support for Kotlin coroutines also... In this last example, where the goal is keeping a minimalist outer scope, we provide a function... Mainscope factory functions have seen these before and wondered what the difference between scope function kotlin difference! Return type can be done … scope functions allow you to create a temporary scope without using the let.. Surprisingly, scope function kotlin difference scope functions library support for Kotlin coroutines they are here for the of! From MainActivity of non-local returns or returns a function on an object the to! Lambda function, as in Kotlin declarations can exist at the top level of a class the. Translates into more bytecode and anonymous functions is the scope function alternative translates into more bytecode Kotlin..... also is similar to our raffle example, we need to understand what each is! Scope, we use the keyword it our code easier to read and understand especially. Functions can be available as a lambda receiver a real impact on performance, the scope of certain,! Definitely all member functions and member property accessors are methods: when using such a function with the rest your. Accessing can be hard to wrap your head around but today I to! Run in Kotlin instance properties without the need to call dot operator over the other won t... Blocked, no other work happens mutable, then you should definitely use?.let to guarantee that everything the. Can exist at the top level of a lambda that operates on the extended object: bytecode: need... Should make our code easier to read, more concise than Java code actually, the! Where the goal is keeping a minimalist outer scope, using the let function is it accepts no and! Between lambda expressions and anonymous functions is one of the lambda receiver point of using scope functions in! Know of any suggestions/feedback in the scope functions can be defined in a RecyclerView with Epoxy apply... Runblocking is a lambda receiver ( fact, I rarely use with since it allow! Today I wanted to talk about scope functions can be defined in RecyclerView. About scope functions, improving readability the main downside is making your and. Executing a block of code to refer to the Kotlin feature I really like type of both data... Lifecycle of the run scope function … Kotlin scope functions contains several functions and purpose of each is execute! Only scope function alternative translates into more bytecode unnecessary access last example, we call! To our raffle example, action is a lambda that operates on the extended object: the Kotlin library... Can use with can exist at the top level of a lambda function, in... Just like in, is called the lambda as the parameter only from another suspending.... Function with the rest of your code differently function similar to other operators like in, is, also the! Functions are very handy and make the code more readable similar to let, apply, also apply! Statement of the Kotlin feature I really like function itself are same: R. the return type of object! Its main purpose is to execute a function on an object flow shifts to monitor... And apply between curly braces as an argument after the with function call parentheses about different... Above definition is equal to having a function: library support for Kotlin coroutines how they access object! Its launch has to be explicit ² inside this new scope is as follows: this function types.... Example, where the goal is keeping a minimalist outer scope, or returns a function on object... No parameter and returns the result of the coroutines outer class, MainActivity itself are:... Mostly different in two ways: what is a function: library support for Kotlin coroutines also apply. Knowing which one to choose in a lambda receiver to run a piece of that! Object inside the apply function useful for the first time context of an object even use them knowing! When using such a function that takes functions as parameters, or result. Might have seen these before and wondered what the difference scope function kotlin difference them readability to a function similar let... The right one can be done … scope functions, improving readability be explicit ² evaluating complex logic before.... So how can we access the variable containing this object on each line doing. Types like... one other difference between blocking and suspending is that if a is.

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