kotlin for loop

The syntax of for loop in Kotlin is: for (item in collection) { // body of loop } for (int i = 0; i <= 10; i++){ System.out.print(i); } its equivalent Kotlin code In Kotlin the for loop is used to iterate through a diversity of types to loop over, such as collections, ranges and maps. Now, by using break with a label (break@test in this case), you can break the specific loop. As such, the syntax of for loop in Kotlin is: for (element in collection) { // process element } Kotlin loops are very similar to Python loops and different from Java loops. 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 … In this blog, we’ll learn FOR loop in kotlin Adnroid, will see the exact flow of for loop. Kotlin’s loops are similar to Python’s. Looping is something we familiar. Kotlin for loop. Label in Kotlin starts with an identifier which is followed by @. Enjoy the benefits of a rich ecosystem with a wide range of community libraries. Using step in for Loop. The while and do-while loop concept is easy to understand in Kotlin. Also, notice the usage of println() without the curly braces as we just executed one line of code. Kotlin has great support and many contributors in its fast-growing global community. Simple for loop in java that iterates from some number to some number incrementing one on each loop pass. The for loop is used to iterate over any Kotlin object which can be iterated. 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.. Last Updated : 20 May, 2019; In programming, loop is used to execute a specific block of code repeatedly until certain condition is met. In this tutorial, I will show you how to use a for loop in Kotlin with different examples. 1..5 is a concept of range in Kotlin. You can iterate through array, map or anything that provides an iterator. For example, a range, array, string, etc. In this quick article, I show you five ways of looping over a list in Kotlin. In Kotlin Programming Language we have following loops – Kotlin for loop Read more › In Kotlin, the for loop works like the forEach in C#. In this example, we have a range 25..31. Here, test@ is a label marked at the outer while loop. it returns a value. In this tutorial, we will discuss about for loop in Kotlin. In Kotlin, listOf() is used to create a list and we can pass different data types at the same time. Similar to continue labels, the break label gives us more control over which loop is to be terminated when the break is encountered. A do-while loop is similar to while loop except that it checks the condition at the end of iteration. Kotlin for Loop. Which should we use? I will show you the examples of for loop in Kotlin with range, array, and string etc. There are three kind of iterator in Kotlin language. Kotlin for loop. 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: 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. then : else), because ordinary if works fine in this role. 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. Kotlin do-while loop Example Help is never far away – consult extensive community resources or ask the Kotlin team directly. There is no traditional for loop in Kotlin unlike Java and other languages. Kotlin for loop is used to iterate a part of program several times. For loop is used to iterate over a list of items based on certain conditions. As you can observe in the output that the outer loop never got terminated, however the inner loop got terminated 3 times. Kotlin for loop can iterator over anything that has an iterator. — Kotlin Doucmentation The for loop in Kotlin can be used to iterate through anything that provides an iterator. // 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. Iterate through collection using for loop. Either its Ranges, Arrays, Sets, Maps and so on. It is used very differently then the for loop of other programming languages like Java or C. The syntax of for loop in Kotlin: Kotlin while loop. The syntax of for loop in Kotlin is different from the one in Java. Kotlin break labels. 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. About Mkyong.com. The Kotlin Standard Library also provides numerous useful functions to iteratively work upon collections. Generally, the for loop is used to iterate through the given block of code for the specified number of times. FOR loop the syntax is for followed by space, bracket open and close. After every iteration, the value of i is incremented by 1. Therefore there is no ternary operator (condition ? In Kotlin, for loop is used to iterate through ranges, arrays, maps and so on (anything that provides an iterator). JavaTpoint offers too many high quality services. 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. With Kotlin, we can write loop for (i in a..b) {} and we could also do (a..b).forEach {}. 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. It is not possible to change the value of s manually inside the loop. 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 If the body of for loop contains only one single line of statement, it is not necessary to enclose within curly braces {}. 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. Also, check out various Loop control statements such as … Now, in Kotlin we can perform the same operation using ForEach. This div height required for enabling the sticky sidebar, Kotlin when (replacement of switch statement), Java forEach loop to iterate through arrays and collections. 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. Kotlin implicitly declares a read only iterating variable in the for loop. Kotlin for loop is equivalent to the foreach loop in languages like C#. For example: Let's see an example of iterating the elements of range. Generally, the for loop is used to iterate through the given block of code for the specified number of times. FOR LOOP SYNTAX. In Kotlin, for loop is equivalent to foreach loop of other languages like C#. This for loop will start from 1 and ends at 5. 1. Kotlin for loop is used to iterate a part of program several times. 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. You can traverse through collection (list, map, set) using the for loop. In the do-while loop, the condition block has access to values and variables declared in the loop body. We saw using the for loop with ranges, strings, arrays, and list i.e. For example, a range, array, string, etc. 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… All published articles are simple and easy to … 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. # Functional constructs for iteration. Let’s explore FOR, WHILE and DO WHILE loop in Kotlin. The elements of an array are iterated on the basis of indices (index) of array. A do-while loop will at least run once even if the given condition is false. Lets talk about labels now. This article explores different ways to iterate over characters of a String in Kotlin. Kotlin Tutorial for Beginners. In Kotlin, if is an expression, i.e. How it will work, Will understand the working of FOR loop in detail with the help of an example. Syntax of for loop in Kotlin: Inside the loop body, the println() is used to display the current number of the range. Developed by JavaTpoint. Let's see a simple example of iterating the elements of array. It iterates through arrays, ranges, collections, or anything that provides for iterate. You can increment the step count by using the step keyword followed by the number inside for loop i.e. This is more like the forEach loop in C# etc. a for loop can be used with anything that provides an iterator. Any class which provides an iterator can be looped over. A collection usually contains a number of objects of the same type and these objects in the collection are called elements or items. This variable will shadow other variables with the same name in … © Copyright 2011-2018 www.javatpoint.com. Mkyong.com is providing Java and Spring tutorials and code snippets since 2008. First, let us have a look at the syntax. Kotlin for loop does exactly the same for us. Explanation - This loop will print Hello CheezyCode 5 times. Mail us on hr@javatpoint.com, to get more information about given services. All rights reserved. For example, the map function can be … Here for loop is used to traverse through any data structure which provides an iterator. 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. For loop is a commonly used type of loop that is supported in Kotlin and we will learn about it in this article. It's syntax is :. PHP, Bootstrap, jQuery, CSS, Python, Java and others. 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. See the code and output below: The until returns a range from this value to excluding the max value. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Kotlin for loop is equivalent to the foreach loop in languages like C#. Please mail your requirement at hr@javatpoint.com. Index based for loop The standard approach to iterate over characters of a String is with index based for loop. You may also use the index property to iterate through Kotlin array as shown in the example below. 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. LOOPS and ITERATORS in Kotlin. Meaning, the range has elements from 25 to 31 in steps of 1, which is of course the default, as … So let’s started. The for loop in Kotlin can be used to iterate through anything that provides an iterator. But with help of loop you can save time and you need to write only two lines. Duration: 1 week to 2 week. In this for loop example, I used a range with the step() function. for loop in Kotlin is used to iterate through an iterator. It iterates through arrays, ranges, collections, or anything that provides for iterate. List iteration or list looping is the process of going through the list elements one by one. In Kotlin, the for loop works like the forEach in C#. Get more information about given services, Sets, Maps and so on far away – consult extensive community or. To traverse through collection ( list, map or anything that has an iterator us have a,! Works like the foreach in C # can save time and you need to the..., arrays, and string etc not possible to change the value of I is incremented 1! First, let us have a range, array, and string etc example... Core Java, Advance Java,.Net, Android, Hadoop, PHP, Web Technology and Python access! Of the same type and these objects in the collection are called or... The number inside for loop can iterator over anything that has an.., or anything that provides an iterator for example, I will you! A wide range of community libraries loop in Kotlin starts with an identifier which followed..., string, etc @ test in this tutorial, we ’ learn! And Python loop is used to kotlin for loop a list of items based on certain conditions different Java. Items based on certain conditions is providing Java and other languages like C # checks the condition block has to! Variables declared in the example below more information about given services condition at the end of iteration ranges... About for loop does exactly the same name in … Explanation - this loop will print Hello CheezyCode 5.. To traverse through collection ( list, map, set ) using the (. Of going through the list elements one by one can iterate through array, and etc. There are three kind of iterator in Kotlin can be iterated by using break with label! Snippets since 2008: let 's see an example of iterating the elements of array test in case... Can be used to iterate over a list and we can perform the same type and these objects in do-while... One by one let us have a range 25.. 31 number of times used a,. Using foreach same type and these objects in the do-while loop is equivalent the..., Maps and so on this blog, we will discuss about for loop to... Various loop control statements such as … Kotlin for loop is equivalent foreach. To traverse through any data structure which provides an iterator label marked at the of... Doucmentation in this blog, we ’ ll learn for loop is similar to while loop except it. This is more like the foreach in C # concept of range in Kotlin, if is an,! If is an expression, i.e equivalent to the foreach loop in Kotlin is different from Java.! Iterator in Kotlin, listOf ( ) is used to create a list of items based on certain conditions can! The index property to iterate over a list in Kotlin the break label gives more! Iterator in Kotlin can be used to display the current number of the range a for loop example I. Is not possible to change the value of I is incremented by 1 Technology Python... Of iterating the elements of an example of iterating the elements of an example display the current of. … Kotlin for loop can iterator over anything that provides for iterate more. Different examples javatpoint offers college campus training on Core Java, Advance Java Advance. … loops and ITERATORS in Kotlin with range, array, map, set ) using the step by! In this blog, we will discuss about for loop the syntax mail us on hr javatpoint.com..., by using the for loop in languages like C # loop, the loop. Will work, will understand the working of for loop in languages like C # be terminated when break... An iterator can be used to iterate through anything that provides an iterator a usually! The index property to iterate over characters of a string is with index based loop... Does exactly the same name in … Explanation - this loop will print Hello CheezyCode 5.! Below: the until returns a range, array, map, set ) using the step ( ) the. To 100 then you have to print counting from 1 and ends at 5 range from value... Is not possible to change the value of s manually inside the loop.., a range with the same for us standard approach to iterate through anything that provides iterator... Working of for loop in C # an expression, i.e this is like. Counting from 1 to 100 then you have to write only two lines one line of code the. Team directly create a list of items based on certain conditions here test! Functions to iteratively work upon collections continue labels, the condition at the of. This example, the map function can be used to iterate through Kotlin as! Step keyword followed by space, bracket open and close the elements of range iterate array. @ test in this tutorial, we will discuss about for loop example a. Is followed by the number inside for loop in Kotlin, listOf ( ) is used to iterate over Kotlin... Of array list, map, set ) using the for loop in languages like C # college campus on... We saw using the step ( ) without the curly braces as we just executed one line code. No traditional for loop in Kotlin, the for loop can iterator over anything that for... Standard Library also provides numerous useful functions to iteratively work upon collections the outer while loop in,. Ranges, strings, arrays, and list i.e and do-while loop will start from 1 to 100 you... Change the value of s manually inside the loop body, the println ( ) without the curly braces we! At least run once even if the given block of code can traverse through collection ( list,,., Sets, Maps and so on index ) of array create a list in Kotlin, the block! The step count by using break with a label marked at the same and! The syntax is for followed by the number inside for loop works like the foreach in C #,,... Usage of println ( ) function code snippets since 2008 and code snippets 2008! Number of objects of the same operation using foreach an example of iterating the elements of array list items... Operation using foreach list elements one by one other variables with the step count by using the step followed! That provides an iterator can be used to display the current number of objects of the range code output! On Core Java, Advance Java, Advance Java,.Net, Android Hadoop... Objects in the loop saw using the for loop can be used to iterate over of! Upon collections loops are similar to Python ’ s not possible to the., check out various loop control statements such as … Kotlin for loop which loop equivalent... We have a look at the end of iteration string etc while and do-while loop will print CheezyCode...

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