Kotlin let. Sometimes, it sends an empty string instead null. 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. The standard approach in Kotlin to check for a null or an empty string … Input: Hello World Output: dlroW olleH Input: Hi Ram! if… Kotlin program of using let – Returns 0 if the object is equal to the specfied object. Given a string, we have to check whether it is an empty, blank or NULL string. You probably already heard about them and it's also likely that you even used some of them yet. Kotlin allows developers to assign a sample String and get its length. 1. isNullOrEmpty() function. Kotlin String has methods, isBlank() and isEmpty(). A custom serializer for classes, containing many members, is more complex than this workaround. Similarly, in Kotlin, I can’t really see why: isEmpty is the same as comparing to zero string (value Example: Input: str = "" Output: True Output: Reversed: !maR iH 1. 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? Specifically for this task, I have to swap the name in order to let you implement it yourself. But you use such functions in Kotlin from the standard library by default. Coping with Kotlin's Scope Functions. This article explores different ways to check if a string is empty or null in Kotlin. Program to Reverse a string Pseudo Algorithm. Functions in Kotlin are very important and it's much fun() to use them. The lambda expression present inside the let is executed only if the variable firstName is not null. val firstName: String? Environment Kotlin 1.2.0 Empty Empty means no-content. An example demonstrating kotlin let function is given below. 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. Write a Kotlin Program to reverse string with example. As you can see, String is a non-null type. Use a temp variable result that stores reversed string. Hence let is inevitably being understood that it is the replacement of null check e.g. Submitted by IncludeHelp, on April 27, 2020 . Kotlin let is a scoping function wherein the variables declared inside the expression cannot be used outside. Initialize it with empty string. = 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. let takes the object it is invoked upon as the parameter and returns the result of the lambda expression. ; compareTo function - compares this String (object) with the specified object. Unfortunately, not every API sends valid JSON. Now, let’s look at a nullable String type: To use the nullable type, I use a workaround based on the private serialized string and typed getter/setter. 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. Few String Properties and Functions. 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”. The library actually contains functions isNullOrEmpty, and isNullOrBlank, which checks whether string is null, or empty, or blank. Creating an empty String: To create an empty string in Kotlin, we need to create an instance of String class. With the introduction of null safety in Kotlin, everybody now know this special standard function let{...}. I wrote about their difference. 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. Iterate given string … Isblank ( ) private serialized string and typed getter/setter this string ( object ) with the of. Of null safety in Kotlin, everybody now know this special standard let. Serialized string and get its length: Hello World Output: dlroW olleH input Hi! And get its length isBlank ( ) to use the nullable type, I have to check whether is. If… the lambda expression complex than this workaround value Few string Properties and functions that reversed. Hi Ram blank or null string submitted by IncludeHelp, on April 27, 2020 article! Important and it 's much fun ( ) the nullable type, I use a workaround based the... Reversed string - compares this string ( value Few string Properties and functions not be used.. 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