Let's see a simple example of iterating the elements of array. Using step in for Loop. Here, test@ is a label marked at the outer while loop. Kotlin break labels. As you can observe in the output that the outer loop never got terminated, however the inner loop got terminated 3 times. How it will work, Will understand the working of FOR loop in detail with the help of an example. Any class which provides an iterator can be looped over. For loop is used to iterate over a list of items based on certain conditions. About Mkyong.com. The example below shows using the until in the for loop and again we will display the numbers: You can see, the 10 is not displayed, unlike the first range example. There is no traditional for loop in Kotlin unlike C, C++, Java etc., which will execute until a condition returns false.The for loop in Kotlin is similar to forEach loop in Java.. It's syntax is :. This is more like the forEach loop in C# etc. An array of four items is created which is followed by iterating through its items using a for loop: You can see the array items are displayed without using the index property. As such, the syntax of for loop in Kotlin is: for (element in collection) { // process element } FOR LOOP SYNTAX. Inside the loop body, the println() is used to display the current number of the range. This example uses the index property in the for loop: The for loop can also be used with the withIndex() property to iterate arrays: In the following example, a mutable list of five items is created and then a for loop is used to iterate through that list and displaying its items: In this tutorial of Kotlin for loop, we learned that the for is a different type of loop then in other languages like Java. Syntax of for loop in Kotlin: The for loop in Kotlin can be used to iterate through anything that provides an iterator. for loop in Kotlin is used to iterate through an iterator. In Kotlin, listOf() is used to create a list and we can pass different data types at the same time. Either its Ranges, Arrays, Sets, Maps and so on. Meaning, the range has elements from 25 to 31 in steps of 1, which is of course the default, as … Enjoy the benefits of a rich ecosystem with a wide range of community libraries. Kotlin loops are very similar to Python loops and different from Java loops. A do-while loop is similar to while loop except that it checks the condition at the end of iteration. It provides you the functionality to rerun the same lines of code again and again but has certain advantages which reduce the code making it easier for the developer and hence improves efficiency. A collection usually contains a number of objects of the same type and these objects in the collection are called elements or items. PHP, Bootstrap, jQuery, CSS, Python, Java and others. — Kotlin Doucmentation © Copyright 2011-2018 www.javatpoint.com. Following is the implementation of for loops in Kotlin to print numbers 0 to 5. for (i in 0..5) { print(i) } Few inferences from the above syntax are listed below: This div height required for enabling the sticky sidebar, Kotlin when (replacement of switch statement), Java forEach loop to iterate through arrays and collections. You may also use the index property to iterate through Kotlin array as shown in the example below. See the code and output below: The until returns a range from this value to excluding the max value. List iteration or list looping is the process of going through the list elements one by one. Developed by JavaTpoint. Index based for loop The standard approach to iterate over characters of a String is with index based for loop. Also, notice the usage of println() without the curly braces as we just executed one line of code. The general way of using the for loop is: You may also provide a block of code by using curly braces: In the first example of using the for loop in Kotlin, I am using a range from 3 to 10. # Functional constructs for iteration. For loop is a commonly used type of loop that is supported in Kotlin and we will learn about it in this article. Please mail your requirement at hr@javatpoint.com. Kotlin for loop is equivalent to the foreach loop in languages like C#. So let’s started. Let’s explore FOR, WHILE and DO WHILE loop in Kotlin. 1. listOfMindOrks.forEach { Log.d(TAG,it) } This will also print the same output like before, mindorks.com blog.mindorks.com afteracademy.com As you can see that using forEach inplace to for loop make the code more concise and smart. In Kotlin, the for loop works like the forEach in C#. 1..5 is a concept of range in Kotlin. Now, by using break with a label (break@test in this case), you can break the specific loop. Kotlin Tutorial for Beginners. The following Kotlin program demonstrates how to use a for loop to execute a set of statements for each of the element in the range. This article explores different ways to iterate over characters of a String in Kotlin. It is not possible to change the value of s manually inside the loop. It iterates through arrays, ranges, collections, or anything that provides for iterate. This for loop will start from 1 and ends at 5. The for loop is used to iterate over any Kotlin object which can be iterated. In this quick article, I show you five ways of looping over a list in Kotlin. We saw using the for loop with ranges, strings, arrays, and list i.e. for (int i = 0; i <= 10; i++){ System.out.print(i); } its equivalent Kotlin code Last Updated : 20 May, 2019; In programming, loop is used to execute a specific block of code repeatedly until certain condition is met. In Kotlin, for loop is used to iterate through ranges, arrays, maps and so on (anything that provides an iterator). The syntax of for loop in Kotlin is: for (item in collection) { // body of loop } Now, in Kotlin we can perform the same operation using ForEach. Kotlin While Loop Syntax The syntax of Kotlin while loop is: while (ExpressionCondtion) { // While code block } Before entering in the while loop ExpressionCondtion is checked. it returns a value. The syntax of for loop in Kotlin is different from the one in Java. In the do-while loop, the condition block has access to values and variables declared in the loop body. 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