Understanding JavaScript While Loops
While loops in JavaScript repeatedly execute a block of code as long as a specified condition is true. This article covers the syntax, examples, and differences between while and do-while loops. Dive into JavaScript looping constructs to enhance your programming skills.
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while Syntax The while loop loops through a block of code as long as a specified condition is true. while (condition) { code block to be executed; }
i i < 10 condition is tested, if TRUE, code block executed increment while Syntax i = 0 0 < 10 TRUE i = i + 1 0 + 1 <script> var text = ""; var i = 0; i = 1 1 < 10 TRUE i = i + 1 1 + 1 i = 2 2 < 10 TRUE i = i + 1 2 + 1 i = 3 3 < 10 TRUE i = i + 1 3 + 1 i = 4 4 < 10 TRUE i = i + 1 4 + 1 i = 5 5 < 10 TRUE i = i + 1 5 + 1 while (i < 10) { text += "<br>The number is " + i; i++; } document.getElementById("demo").innerHTML = text; </script> i = 6 6 < 10 TRUE i = i + 1 6 + 1 i = 7 7 < 10 TRUE i = i + 1 7 + 1 i = 8 8 < 10 TRUE i = i + 1 8 + 1 i = 9 9 < 10 TRUE i = i + 1 9 + 1 i = 10 10 < 10 FALSE Loop stops
do while Syntax Loop will execute the code block once, before checking if the condition is true do { code block to be executed } while (condition);
do while Syntax The do while loop code executes at least once as long then continues if condition is true. <script> var text = "" var i = 0; do { text += "<br>The number is " + i; i++; } while (i < 10); document.getElementById("demo").innerHTML = text; </script>
Test Yourself With Exercises JS While Loops In the W3Schools Tutorial, complete Exercise
