Here I will introduce a simple way to clearly distinguish their differences and how to pick which to use. I like that your article is written from a Developer’s perspective, but I think it is also important to mention the examples of apps written in both Java and Kotlin. The functions that I’ll focus on is run, with, T.run, T.let, T.also and T.apply. I use gitlab and its built-in CI for my person blog (see details). Kotlin let vs run vs also vs apply vs with. The title might sound weird at beginning since many modern libraries or tools are designed to make developers write less code via ways like code generation or reflection. With Kotlin we can easily avoid those common pain points when writing custom views and still enjoy full interoperability with Android! To demonstrate the differences I have created a simple Kotlin project, which you can find on GitHub. Kotlin also benefits from being a modern programming language, built with the benefit of learning from the languages that came before it. https://discuss.kotlinlang.org/t/let-vs-with-vs-run/30, https://stackoverflow.com/questions/38501764/difference-between-with-and-run-in-kotlin, https://discuss.kotlinlang.org/t/spreadsheet-for-differences-between-let-with-run-apply-and-also/5029, Android Kotlin Coroutine Scope for Activity, Fragment and ViewModel (Architecture Components), Setup Android Kotlin Coroutines (1.1) With Coroutine Scope, Android Kotlin Coroutines Setup and Basic Usage, Creative Commons Attribution-NonCommercial 4.0 International License, not suited for null checking or call chaining. Besides, since Android Studio 3.0 (published in October 2017), Kotlin is also part of the Android SDK and is involved in the IDE’s installation package as an option to the standard Java compiler. Because block is defined as (T) -> Unit, but it is defined as T.() -> Unit in apply(). Pengaturcaraan gaya fungsional sangat disokong dan disokong oleh sintaks Kotlin dan pelbagai fungsi dalam perpustakaan standard Kotlin. We must know when to use which one. I made a simple comparison chart to include the characteristics and hopefully we can see the differences more easily: These functions looks very similar and can be interchangable in some use cases. Common. JVM. Common. A key difference is that in Kotlin, try is also an expression that can return a result. A week ago I was thinking of writing a small Kotlin command line tool to read some local json files. Smartherd 9,697 views I opened IntelliJ and started a kotlin project with gradle. Supported and developed by JetBrains. #12.1 Kotlin Null Safe Operators. Today I was trying to “update” hugo in the docker image, and I found myself making a couple of mistakes, including losing the dockerfile for the base image I built a long time ago! Writing custom views or view groups is quite common nowadays, but sometimes it can be really cumbersome. Safe Call, with Let, Elvis & Non-null operator. Understanding: we analyze the Purpose understanding variable, and we compare the odds of a correct answer when the program is written in Java vs. Kotlin. Let's assume Apply is a person name, I can make a grammatically correct English sentence with them: it also let Apply run. also vs. apply. Scoping functions. Pixtory App (Alpha) - easily organize photos on your phone into a blog. An object consists of : State: It is represented by attributes of an object. The first one returns the enclosing string builder since append() returns the string builder itself, but the second one returns 37 since length() returns an integer. These apply to both catching and throwing exceptions, as well as to the exceptions themselves. In this post, I will walk through those confusing functions and see if we can understand the differences. Since it’s the last argument, so Kotlin allows you move the function declaration out of the method parenthesis. In Kotlin, we can create multiple objects of a class. All of these five functions basically do very similar things. Behavior: It is represented by methods of an object. The last expression of … The withfunction is basically defined as follows: By using it, we can make the code more concise. Autovalue uses annotation processor to generate model objects, but IntelliJ just would not invoke annotation processing properly so the compilation failed. The also, apply, let, run, and with functions, when used properly in Kotlin, make your code more readable. In my previous post Kotlin “By” Class Delegation: Favor Composition Over Inheritance I covered using by keyword for class delegations. So you can simply see apply() as a “simpler” version of also() that it has an implicit this defined to be used in the function body. 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