This is invalid: //error: "else" cannot be used as a variable name These keywords cannot be used as identifiers. In this guide, we will learn about keywords and identifiers. These words are called reserved words or keywords. That’s all for Kotlin standard functions to alter variables or modify objects within the function.There are certain words in Kotlin that have special meaning and cannot be used as identifiers(variable name, function name, class name etc). The last expression of with function returns a result.apply runs on the object reference, whereas with just passes it as an argument.with runs without an object(receiver) whereas apply needs one.data class Person(var name: String, var tutorial : String)Īgain with is similar to apply except for a few differences. Like apply, with is used to change instance properties without the need to call dot operator over the reference every time. We should use also only when we don’t want to shadow this. If the property name of the data class is unique in the function, you can omit this. data class Person(var name: String, var tutorial : String)Īpply vs also data class Person(var n: String, var t : String) It runs on the object reference (also known as receiver) into the expression and returns the object reference on completion. Kotlin apply is an extension function on a type. The also expression returns the data class object whereas the let expression returns nothing (Unit) as we didn’t specify anything explicitly. In the above code, we’ve used Data classes. An example demonstrating kotlin let function is given below. Kotlin let is a scoping function wherein the variables declared inside the expression cannot be used outside. Let takes the object it is invoked upon as the parameter and returns the result of the lambda expression. The functions that we’re going to discuss below are: We’ll see how they make programming in Kotlin so easier and faster. The kotlin-stdlib provides us with useful higher order functions implementing idiomatic patterns. In this tutorial, we’ll be implementing some of the important standard library functions available in Kotlin.
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