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