In Kotlin the for loop is used to iterate through a diversity of types to loop over, such as collections, ranges and maps. It iterates through arrays, ranges, collections, or anything that provides for iterate. Mail us on hr@javatpoint.com, to get more information about given services. The elements of an array are iterated on the basis of indices (index) of array. 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. You can increment the step count by using the step keyword followed by the number inside for loop i.e. This for loop will start from 1 and ends at 5. Mkyong.com is providing Java and Spring tutorials and code snippets since 2008. PHP, Bootstrap, jQuery, CSS, Python, Java and others. FOR loop the syntax is for followed by space, bracket open and close. Simple for loop in java that iterates from some number to some number incrementing one on each loop pass. In this for loop example, I used a range with the step() function. 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. The syntax of for loop in Kotlin is different from the one in Java. Also, notice the usage of println() without the curly braces as we just executed one line of code. See the code and output below: The until returns a range from this value to excluding the max value. # Functional constructs for iteration. You can iterate through array, map or anything that provides an iterator. In Kotlin, the for loop works like the forEach in C#. A do-while loop is similar to while loop except that it checks the condition at the end of iteration. In Kotlin, if is an expression, i.e. 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. The while and do-while loop concept is easy to understand in Kotlin. Last Updated : 20 May, 2019; In programming, loop is used to execute a specific block of code repeatedly until certain condition is met. But with help of loop you can save time and you need to write only two lines. Kotlin implicitly declares a read only iterating variable in the for loop. There are three kind of iterator in Kotlin language. Generally, the for loop is used to iterate through the given block of code for the specified number of times. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. 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 LOOPS and ITERATORS in Kotlin. Kotlin for loop is equivalent to the foreach loop in languages like C#. Also, check out various Loop control statements such as … This is more like the forEach loop in C# etc. Using step in for Loop. 1. I will show you the examples of for loop in Kotlin with range, array, and string etc. So let’s started. It is used very differently then the for loop of other programming languages like Java or C. The syntax of for loop in Kotlin: Enjoy the benefits of a rich ecosystem with a wide range of community libraries. FOR LOOP SYNTAX. Please mail your requirement at hr@javatpoint.com. Kotlin for loop. About Mkyong.com. 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. For example, the map function can be … © Copyright 2011-2018 www.javatpoint.com. Kotlin for loop does exactly the same for us. First, let us have a look at the syntax. In this tutorial, I will show you how to use a for loop in Kotlin with different examples. a for loop can be used with anything that provides an iterator. In this blog, we’ll learn FOR loop in kotlin Adnroid, will see the exact flow of for loop. Kotlin while loop. for (int i = 0; i <= 10; i++){ System.out.print(i); } its equivalent Kotlin code Generally, the for loop is used to iterate through the given block of code for the specified number of times. JavaTpoint offers too many high quality services. Kotlin’s loops are similar to Python’s. 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: A collection usually contains a number of objects of the same type and these objects in the collection are called elements or items. Either its Ranges, Arrays, Sets, Maps and so on. Here, test@ is a label marked at the outer while loop. A do-while loop will at least run once even if the given condition is false. For example, a range, array, string, etc. The for loop in Kotlin can be used to iterate through anything that provides an iterator. Kotlin loops are very similar to Python loops and different from Java loops. For loop is a commonly used type of loop that is supported in Kotlin and we will learn about it in this article. This article explores different ways to iterate over characters of a String in Kotlin. For the understanding, a while loop executes a statement while a certain condition is true.The check of the condition is checked at the beginning of the while loop.The do-while loop in contrast checks the condition at the end of the loop … You may also use the index property to iterate through Kotlin array as shown in the example below. Let’s explore FOR, WHILE and DO WHILE loop in Kotlin. In Kotlin, the for loop works like the forEach in C#. 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. The for loop is used to iterate over any Kotlin object which can be iterated. Explanation - This loop will print Hello CheezyCode 5 times. In this tutorial, we will discuss about for loop in Kotlin. Kotlin for loop is equivalent to the foreach loop in languages like C#. — Kotlin Doucmentation Iterate through collection using for loop. As such, the syntax of for loop in Kotlin is: for (element in collection) { // process element } Kotlin for Loop. If you have to print counting from 1 to 100 then you have to write the print statement 100 times. Kotlin have three types of loops namely: for; while; do while; In this article, we will take a deep look into for loops in Kotlin. Kotlin for loop is used to iterate a part of program several times. Now, by using break with a label (break@test in this case), you can break the specific 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. 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. Index based for loop The standard approach to iterate over characters of a String is with index based for loop. In the do-while loop, the condition block has access to values and variables declared in the loop body. then : else), because ordinary if works fine in this role. List iteration or list looping is the process of going through the list elements one by one. In Kotlin Programming Language we have following loops – Kotlin for loop Read more › In Kotlin, listOf() is used to create a list and we can pass different data types at the same time. 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.. The Kotlin Standard Library also provides numerous useful functions to iteratively work upon collections. All published articles are simple and easy to … Duration: 1 week to 2 week. for loop in Kotlin is used to iterate through an iterator. Let's see a simple example of iterating the elements of array. Label in Kotlin starts with an identifier which is followed by @. Meaning, the range has elements from 25 to 31 in steps of 1, which is of course the default, as … Kotlin has great support and many contributors in its fast-growing global community. 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