kotlin for loop

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

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