W3Schools
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JavaScript While Loop
In the following example, the code in the loop will run, over and over again, as long as a variable (i) is less than 10: while (i < 10) { text += "The number is " + i; i++; } Try it Yourself » · If you forget to increase the variable used in the condition, the loop will never end. This will crash your browser. The do while loop is a variant of the while loop.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Statements › do...while
do...while - JavaScript - MDN Web Docs - Mozilla
let result = ""; let i = 0; do { i += 1; result += `${i} `; } while (i > 0 && i < 5); // Despite i === 0 this will still loop as it starts off without the test console.log(result); Because the statement is always executed once, do...while (false) is the same as executing the statement itself.
Videos
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#16 While loop in JavaScript - YouTube
Mozilla
developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Loops_and_iteration
Loops and iteration - JavaScript - MDN Web Docs - Mozilla
At the end of every execution, the condition is checked. When the condition is false, execution stops, and control passes to the statement following do...while. In the following example, the do loop iterates at least once and reiterates until i is no longer less than 5.
W3Schools
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JavaScript do...while Loop
The do...while is used when you want to run a code block at least one time. If you use a variable in the condition, you must initialize it before the loop, and increment it within the loop. Otherwise the loop will never end.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Statements › while
while - JavaScript - MDN Web Docs - Mozilla
After completing the third pass, the condition n < 3 is no longer true, so the loop terminates. In some cases, it can make sense to use an assignment as a condition. This comes with readability tradeoffs, so there are certain stylistic recommendations that would make the pattern more obvious for everyone. Consider the following example, which iterates over a document's comments, logging them to the console. ... const iterator = document.createNodeIterator(document, NodeFilter.SHOW_COMMENT); let currentNode; while (currentNode = iterator.nextNode()) { console.log(currentNode.textContent.trim()); }
Programiz
programiz.com › javascript › while-loop
JavaScript while and do...while Loop (with Examples)
Finally, we display the total sum of positive numbers. Note: When we add two or more numeric strings, JavaScript treats them as strings. For example, "2" + "3" = "23". So, we should always convert numeric strings to numbers to avoid unexpected behaviors. The do...while loop executes a block ...
JavaScript.info
javascript.info › tutorial › the javascript language › javascript fundamentals
Loops: while and for
But here we have the postfix form i++. So it increments i to 5, but returns the old value. Hence the comparison is actually while(4 < 5) – true, and the control goes on to alert. The value i = 5 is the last one, because on the next step while(5 < 5) is false. ... For each loop write down which values it is going to show.
TutorialsPoint
tutorialspoint.com › javascript › javascript_while_loop.htm
JavaScript - While Loops
The JavaScript while loop is similar to the for loop with the first and third expressions omitted. A for loop is generally used when the number of iteration is fixed and known but we use the while loop whne the number of iterations is not known. Let's take an example of printing the first five natural numbers using for loop − · <html> <body> <p> First five natural numbers:</p> <div id = "demo"> </div> <script> const output = document.getElementById("demo"); for(let i = 1; i <= 5; i++){ output.innerHTML += i + "<br>"; } </script> </body> </html>
W3Schools
w3schools.com › js › js_loops.asp
JavaScript Loops
In the following example, the code in the loop will run, over and over again, as long as a variable (i) is less than 10: while (i < 10) { text += "The number is " + i; i++; } Try it Yourself » · If you forget to increase the variable used in the condition, the loop will never end. This will crash your browser. The do while loop is a variant of the while loop.
GeeksforGeeks
geeksforgeeks.org › javascript › javascript-do-while-loop
JavaScript do...while Loop - GeeksforGeeks
July 23, 2025 - Explanation: We can see that even if the condition is not satisfied in the do...while loop the code still runs once, but in the case of while loop, first the condition is checked before entering into the loop. Since the condition does not match therefore the while loop is not executed. Note: When we are writing conditions for the loop we should always add a code that terminates the code execution otherwise the loop will always be true and the browser will crash. ... We prefer you to check this article to know more about JavaScript Loop Statements.
JavaScript Tutorial
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JavaScript do while Loop
November 15, 2024 - while (number != secretNumber);Code language: JavaScript (javascript) Use the do while statement to create a loop that executes a code block until a condition is false.
Tutorial Republic
tutorialrepublic.com › javascript-tutorial › javascript-loops.php
JavaScript While, Do-While, For and For-In Loops - Tutorial Republic
With a do-while loop the block of code executed once, and then the condition is evaluated, if the condition is true, the statement is repeated as long as the specified condition evaluated to is true. The generic syntax of the do-while loop is: ... The JavaScript code in the following example defines a loop that starts with i=1.
DigitalOcean
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Using While Loops and Do...While Loops in JavaScript | DigitalOcean
August 26, 2021 - The while statement is the most basic loop to construct in JavaScript. As an example, let’s say we have an aquarium that has a population limit. For each iteration of the loop, we will add one fish.
GeeksforGeeks
geeksforgeeks.org › javascript-do-while-loop
JavaScript do…while Loop | GeeksforGeeks
July 30, 2024 - The while loop executes a block ... and continues running as long as the condition remains trueHere's an example that prints from 1 to 5....
Kirupa
kirupa.com › html5 › loops_in_javascript.htm
For, While, and Do...While Loops in JavaScript
That is captured by the cryptic looking i++. We'll cover what the ++ means later when we look at how numbers and math in JavaScript work, but another way of representing this would be to say i = i + 1. Going back to the stage we skipped, we have the condition part of our loop that determines when the loop will stop running: In our example, the condition is that our i variable is less than the value of 10:
Guru99
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For, While and Do While LOOP in JavaScript (with Example)
March 9, 2024 - Inside the while loop, you should include the statement that will end the loop at some point of time. Otherwise, your loop will never end and your browser may crash. ... <html> <head> <script type="text/javascript"> document.write("<b>Using while loops </b><br />"); var i = 0, j = 1, k; document.write("Fibonacci series less than 40<br />"); while(i<40) { document.write(i + "<br />"); k = i+j; i = j; j = k; } </script> </head> <body> </body> </html>
Alma Better
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JavaScript for, while, and do-while Loops
June 22, 2023 - This means that the do-while loop will always execute the code block at least once, while the while loop may not execute the code block at all if the condition is false. A. break statement The break statement is used to terminate a loop before it has completed all of its iterations. When a break statement is encountered inside a loop, the loop is immediately terminated, and the program continues to execute the next statement after the loop. Here's an example:
Medium
medium.com › @francesco-saviano › 10-exercises-with-while-loops-in-javascript-8cfb2bd81a71
10 Exercises with While Loops in JavaScript | by Francesco Saviano | Medium
October 24, 2024 - Write a JavaScript program to check whether a given number is a prime number using a while loop. A prime number is a number greater than 1 that has no positive divisors other than 1 and itself. For example, 2, 3, 5, 7, and 11 are prime numbers.
JavaScript Tutorial
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JavaScript while Loop By Examples
November 15, 2024 - Second, add value of i to the total as long as i is less than or equal to 100: while (i <= 100) { total += i; i++; }Code language: JavaScript (javascript) Note that you need to increment i by one in each iteration.
StudySmarter
studysmarter.co.uk › computer science › computer programming › javascript do while loop
Javascript Do While Loop: Syntax & Technique | StudySmarter
The loop will run and print the value of 'i'. Then, 'i' is incremented by 1. This continues till 'i' is less than 5, post which the loop will terminate. In this section, you will be taken through a comprehensive dissection and analysis of examples related to the Javascript Do While Loop.