isEmpty is the same as comparing to zero string (value However, when you want to assign null, the compiler will protest with an error: “Null can not be a value of a non-null type String”. Write a Kotlin Program to reverse string with example. Environment Kotlin 1.2.0 Empty Empty means no-content. Kotlin | Check for empty string: Here, we are going to learn how to check whether a given string is an empty, blank or NULL string in Kotlin programming language? A custom serializer for classes, containing many members, is more complex than this workaround. Specifically for this task, I have to swap the name in order to let you implement it yourself. Creating an empty String: To create an empty string in Kotlin, we need to create an instance of String class. Kotlin String has methods, isBlank() and isEmpty(). One special collection of relevant functions can be described as "scope functions" and they are part of the Kotlin standard library: let, run, also, apply and with. Program to Reverse a string Pseudo Algorithm. Kotlin let. ; compareTo function - compares this String (object) with the specified object. The lambda expression present inside the let is executed only if the variable firstName is not null. Use a temp variable result that stores reversed string. Kotlin program of using let – Kotlin allows developers to assign a sample String and get its length. An example demonstrating kotlin let function is given below. Input: Hello World Output: dlroW olleH Input: Hi Ram! Since literals in Kotlin are implemented as instances of String class, you can use several methods and properties of this class.. length property - returns the length of character sequence of an string. let takes the object it is invoked upon as the parameter and returns the result of the lambda expression. Example: Input: str = "" Output: True Hence let is inevitably being understood that it is the replacement of null check e.g. Submitted by IncludeHelp, on April 27, 2020 . You probably already heard about them and it's also likely that you even used some of them yet. Coping with Kotlin's Scope Functions. I wrote about their difference. if… Functions in Kotlin are very important and it's much fun() to use them. Iterate given string … To use the nullable type, I use a workaround based on the private serialized string and typed getter/setter. Sometimes, it sends an empty string instead null. val firstName: String? Few String Properties and Functions. Given a string, we have to check whether it is an empty, blank or NULL string. With the introduction of null safety in Kotlin, everybody now know this special standard function let{...}. But you use such functions in Kotlin from the standard library by default. Returns 0 if the object is equal to the specfied object. If you look at the code for String.Empty it actual refers to “” in the background so, like @ilogico, I could never understand the reason why some people insisted on using String.Empty instead. Unfortunately, not every API sends valid JSON. Now, let’s look at a nullable String type: var variable_name = String() String elements and templates – String Element – The character, digit or any other symbol present in string is called as element of a String. The standard approach in Kotlin to check for a null or an empty string … Output: Reversed: !maR iH 1. This article explores different ways to check if a string is empty or null in Kotlin. The library actually contains functions isNullOrEmpty, and isNullOrBlank, which checks whether string is null, or empty, or blank. 1. isNullOrEmpty() function. As you can see, String is a non-null type. Initialize it with empty string. Kotlin let is a scoping function wherein the variables declared inside the expression cannot be used outside. = null firstName?.let { println(it.toUpperCase()) } Here, the variable firstName is null, so the lambda expression is not executed to convert the string to Upper Case letters. 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