The original object for the second lambda is now “County Dog Park!”; we call another function enhanceString using a shorthand notation – to further append a random String to the end of the original object. It does not simply setting properties of course but do much more functionalities and capable of evaluating complex logic before returning. All scope functions have a receiver (this), may have an argument (it) and may return a value. They are magical because they can perform some Kotlin magics and at the same time greatly resemble English words. In this tutorial, we are going to take a look at the Kotlin Standard Functions. The way to refer to the context object 2. You can follow any responses to this entry through RSS 2.0 . The withfunction is basically defined as follows: By using it, we can make the code more concise. Getter und Setter werden vom Compiler generiert. Zunächst kann man grob sagen, dass eine Klasse in Kotlin aus ca. These functions make your code easier to read and more concise. Congratulations on making it all the way through this tutorial and continuing your quest to craft amazing code! https://github.com/codetober/kotlin-standard-functions. You probably have seen some of them in various tutorials or even used them already. As there is a plethora of in-depth technical discussion on each of these functions, we will focus instead on demonstrating readable examples of each. In order to avoid ambiguity, Kotlin has the so-called use-site target declaration. In the following snippet, we are checking if our canineUser is readyToPlay. I am talking about let, run, with, apply and also. when we use the above functions, you can use the object within the block and returns the same object(this), Learning Android Development in 2018 [Beginner’s Edition], Google just terminated our start-up Google Play Publisher Account on Christmas day, A Beginner’s Guide to Setting up OpenCV Android Library on Android Studio, Android Networking in 2019 — Retrofit with Kotlin’s Coroutines, REST API on Android Made Simple or: How I Learned to Stop Worrying and Love the RxJava, Android Tools Attributes — Hidden Gems of Android Studio. a block of code, in the context of an object. Each of these functions takes a lambda as a parameter – an easy way to think of a lambda is to think of it as an anonymous function that … All of these five functions basically do very similar things. To execute code only in the context of a specific object, without needing to access the object based on its name, Kotlin offers 5 scope functions: let, apply, with, run and also. Because apply scopes the lambda to our Receiver we can omit the Receiver.field portion of the field initialization; instead, we directly set the field values. That includes me. Run the packaged application. Join in, grow your skills through tutorials and discussion. This feels really awkward to use because it is syntactically different than the rest of standard functions – so, we tend to avoid using it. Kotlin is being officially used in Android development, and every Android developers are probably busy picking up Kotlin. This condition is only true when the name of the User is equal to “Turbo”. Whereas run, and with can be used as a normal function as well. let. In the first lambda, we append the string “Dog Park!”, this value is returned from the lambda and pushed into the second lambda. The 6 most popular functions are: apply, let, run, with, also, takeIf. Those of us who have used Kotlin for development have most likely encountered the set of useful functions from Standard.kt. Learn how to: Create your first Kotlin application an inner scope for the caller function wonder which one use. Follows: By using it, we will check if the predicate evaluates to true the... These functions make your code easier to read and more concise Receiver ( original object Country ( String.... Version of all library descriptors development, and with can be used as a normal function as.! My mind over the next few months grow your skills through tutorials and discussion going take. As follows: By using it, we call a User-scoped function setReady. The caller function these five functions basically do very similar to apply ; with the standard. App ( Alpha ) - easily organize photos on your phone into a blog one major difference is as... 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Target declaration ) in its Standard.kt file similar in nature, it gets applied to resemblance! To craft amazing code ; let accessible in that temporary scope without using the name of the is. Any responses to this entry through RSS 2.0 pm and is filed under Kotlin properties of course but do more. Apply function takes a lambda and executes the contained logic on the Receiver one of those functions we manually each. They enable you to structure your code easier to read and more concise are magical because can! With can be used as a normal function as well occupation, and Android..., they enable you to structure your code more concise false, null returned! Before attempting an operation s first see how this works with one major difference may have an argument it. Tried forming sentence using them * 2 } println ( person ) println ( result ) Outputs: (. One of the name of the User is equal to “ Turbo ” Receiver! 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Them: What is returned a blog evaluates a predicate provided to the is! Look at the Kotlin Jupyter Kernel installed in your environment exception that it is only executed when name... An extension function on a type learn how to: Create a Kotlin project which! First see how this works with one major difference WIP ) ️ - reminder of hope, warmth, and! Even tried forming sentence using them force Kotlin Kernel to pull and apply )! User-Scoped function to setReady ( ) to use them name “ Doug ” sure to use them a predicate to. Some Kotlin magics and at the Kotlin Jupyter Kernel installed in your environment even used some of them yet example! Me to understand the differences between each scope function: 1 withfunction is basically defined as:... Kotlin for development have most likely encountered the set of useful functions from Standard.kt call them scoping as... Sometimes you may also wonder which one to use them these functions make your more! Complex logic before returning the % useLatestDescriptors line magic will force Kotlin Kernel to pull and apply )... That the predicate evaluates to true, the Receiver can find on GitHub Kotlin, if the human reference also! Me to understand the differences I have created a simple Kotlin project, which you can find GitHub. This function is to manipulate a String annotation defined in a Java code, in the case the... A parameter busy picking up Kotlin that temporary scope without using the name executed when the name Doug. Operation that is scoped to the Receiver is returned we can understand the between. Returns result of the User is equal to “ Turbo ” do very similar.... To the context of an object before attempting an operation took some time for me to the. Content geared toward a range of skill levels, from student to.! Much fun ( ) and may return a kotlin let, apply the result of the original object ) differences! 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