If the body of for loop contains only one single line of statement, it is not necessary to enclose within curly braces {}. Please mail your requirement at hr@javatpoint.com. There is no traditional for loop in Kotlin unlike Java and other languages. Kotlin do-while loop Example Kotlin for loop. Similar to continue labels, the break label gives us more control over which loop is to be terminated when the break is encountered. A collection usually contains a number of objects of the same type and these objects in the collection are called elements or items. Index based for loop The standard approach to iterate over characters of a String is with index based for loop. Kotlin loops are very similar to Python loops and different from Java loops. © Copyright 2011-2018 www.javatpoint.com. LOOPS and ITERATORS in Kotlin. In Kotlin Programming Language we have following loops – Kotlin for loop Read more › For example, a range, array, string, etc. Kotlin Tutorial for Beginners. Looping is something we familiar. There are three kind of iterator in Kotlin language. 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. 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. JavaTpoint offers too many high quality services. In this for loop example, I used a range with the step() function. 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. 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 Kotlin for loop is equivalent to the foreach loop in languages like C#. Kotlin has great support and many contributors in its fast-growing global community. Here for loop is used to traverse through any data structure which provides an iterator. Meaning, the range has elements from 25 to 31 in steps of 1, which is of course the default, as … 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: Either its Ranges, Arrays, Sets, Maps and so on. Kotlin’s loops are similar to Python’s. It iterates through arrays, ranges, collections, or anything that provides for iterate. Which should we use? Here, test@ is a label marked at the outer while loop. This variable will shadow other variables with the same name in … In this blog, we’ll learn FOR loop in kotlin Adnroid, will see the exact flow of for loop. Now, by using break with a label (break@test in this case), you can break the specific loop. for loop in Kotlin is used to iterate through an iterator. A do-while loop will at least run once even if the given condition is false. If you have to print counting from 1 to 100 then you have to write the print statement 100 times. For loop is used to iterate over a list of items based on certain conditions. Kotlin for loop. 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. In Kotlin, for loop is used to iterate through ranges, arrays, maps and so on (anything that provides an iterator). A do-while loop is similar to while loop except that it checks the condition at the end of iteration. Iterate through collection using for loop. — Kotlin Doucmentation Enjoy the benefits of a rich ecosystem with a wide range of community libraries. Let's see a simple example of iterating the elements of array. For example: Let's see an example of iterating the elements of range. Any class which provides an iterator can be looped over. For example, a range, array, string, etc. You can traverse through collection (list, map, set) using the for loop. a for loop can be used with anything that provides an iterator. it returns a value. Explanation - This loop will print Hello CheezyCode 5 times. 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. 1. // 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 The syntax of for loop in Kotlin is: for (item in collection) { // body of loop } The elements of an array are iterated on the basis of indices (index) of array. For example, the map function can be … Kotlin for loop can iterator over anything that has an iterator. See the code and output below: The until returns a range from this value to excluding the max value. We saw using the for loop with ranges, strings, arrays, and list i.e. In this tutorial, we will discuss about for loop in Kotlin. Now, in Kotlin we can perform the same operation using ForEach. Using step in for Loop. 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