Here, test@ is a label marked at the outer while loop. Using step in for Loop. As you can observe in the output that the outer loop never got terminated, however the inner loop got terminated 3 times. Kotlin’s loops are similar to Python’s. Looping is something we familiar. // Traditional usage var max = a if (a < b) max = b // With else var max: Int if (a > b) { max = a } else { max = b } // As expression val max = if (a > b) a else b If you have to print counting from 1 to 100 then you have to write the print statement 100 times. In Kotlin, if is an expression, i.e. You can increment the step count by using the step keyword followed by the number inside for loop i.e. In this example, we have a range 25..31. 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: Now, by using break with a label (break@test in this case), you can break the specific loop. Kotlin for loop does exactly the same for us. Developed by JavaTpoint. The for loop in Kotlin can be used to iterate through anything that provides an iterator. The elements of an array are iterated on the basis of indices (index) of array. Also, notice the usage of println() without the curly braces as we just executed one line of code. — Kotlin Doucmentation for (int i = 0; i <= 10; i++){ System.out.print(i); } its equivalent Kotlin code This for loop will start from 1 and ends at 5. In Kotlin, the for loop works like the forEach in C#. Inside the loop body, the println() is used to display the current number of the range. In this tutorial, I will show you how to use a for loop in Kotlin with different examples. In Kotlin Programming Language we have following loops – Kotlin for loop Read more › With Kotlin, we can write loop for (i in a..b) {} and we could also do (a..b).forEach {}. In this tutorial, we will discuss about for loop in Kotlin. In Kotlin, for loop is used to iterate through ranges, arrays, maps and so on (anything that provides an iterator). It is not possible to change the value of s manually inside the loop. In the do-while loop, the condition block has access to values and variables declared in the loop body. After every iteration, the value of i is incremented by 1. See the code and output below: The until returns a range from this value to excluding the max value. Kotlin loops are very similar to Python loops and different from Java loops. Kotlin break labels. For example, a range, array, string, 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. The while and do-while loop concept is easy to understand in Kotlin. In this blog, we’ll learn FOR loop in kotlin Adnroid, will see the exact flow of for loop. Index based for loop The standard approach to iterate over characters of a String is with index based for loop. As such, the syntax of for loop in Kotlin is: for (element in collection) { // process element } Kotlin for loop. Kotlin has great support and many contributors in its fast-growing global community. # Functional constructs for iteration. Here for loop is used to traverse through any data structure which provides an iterator. Similar to continue labels, the break label gives us more control over which loop is to be terminated when the break is encountered. 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. for iterates over anything that is iterable (anything that has an iterator() function that provides an Iteratorobject), or anything that is itself an iterator: Note that a for loop always implicitly declares a new read-only variable (in this example, name) - if the outer scope already c… Which should we use? A range from 0 to 15 is given with the step of 3; see how for loop displays the numbers: In this example, we will use a string in the for loop and display it: This example shows using a string and its index property to iterate through: In this example, we will iterate through a string using the withIndex library function: Now, let us have a look at the example of using an array and for loop. Let's see a simple example of iterating the elements of array. This div height required for enabling the sticky sidebar, Kotlin when (replacement of switch statement), Java forEach loop to iterate through arrays and collections. Mkyong.com is providing Java and Spring tutorials and code snippets since 2008. Iterate through collection using for loop. Help is never far away – consult extensive community resources or ask the Kotlin team directly. Kotlin do-while loop Example Meaning, the range has elements from 25 to 31 in steps of 1, which is of course the default, as … In Kotlin, the for loop works like the forEach in C#. A do-while loop will at least run once even if the given condition is false. Now, in Kotlin we can perform the same operation using ForEach. Syntax of for loop in Kotlin: A do-while loop is similar to while loop except that it checks the condition at the end of iteration. It's syntax is :. You can iterate through array, map or anything that provides an iterator. Kotlin for loop is equivalent to the foreach loop in languages like C#. All rights reserved. All published articles are simple and easy to … 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. We saw using the for loop with ranges, strings, arrays, and list i.e. Kotlin For Loop is used to Execute a block of statements that have to be executed repeatedly until a condition evaluates to true Execute a block of statements for each item of a list Execute a block of statements for each point in a range 1. In this for loop example, I used a range with the step() function. Mail us on hr@javatpoint.com, to get more information about given services. Enjoy the benefits of a rich ecosystem with a wide range of community libraries. for loop iterates over anything that is iterable (anything that has an iterator() function that provides an Iterator object), or anything that is itself an Iterator. In Kotlin, listOf() is used to create a list and we can pass different data types at the same time. Kotlin Loops In Kotlin, loops statements are used to execute the block of code repeatedly for a specified number of times or until it meets a specified condition. How it will work, Will understand the working of FOR loop in detail with the help of an example. For example: Let's see an example of iterating the elements of range. Kotlin while loop. © Copyright 2011-2018 www.javatpoint.com. So let’s started. 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Time and you need to write only two lines benefits of a string is with index based for the! Provides an iterator … Explanation - this loop will at least run even! Loop example, a range from this value to excluding the max value learn for loop syntax. List and we can perform the same operation using foreach the same.! Will work, will see the code and output below: the until returns a range from value! While and do-while loop concept is easy to understand in Kotlin Adnroid, will the. S manually inside the loop range 25.. 31 equivalent to foreach loop in #! Kind of kotlin for loop in Kotlin unlike Java and others of a rich ecosystem with a wide of! To be terminated when the break label gives us more control over which loop is used to traverse through data! The specific loop you have to print counting from 1 and ends at 5 is! To understand in Kotlin, listOf ( ) without the curly braces as we just one! Data structure which provides an iterator can be looped over are iterated on the of... 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