stuart-d2
3/7/2016 - 8:25 PM

While Loop and Do

While Loop and Do

While - do Loop.js
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/*

The while statement performs a simple loop. If the expression is falsy, then the loop will break.
While the expression is truthy, the block will be executed.

*/

<!DOCTYPE html>
<html>
<body>
<p>This loops until i is less than 20</p>

<button onclick="myWhileFunction()">Try it</button>

<p id="demo"></p>
 
<script>
function myWhileFunction() {
	var text = ""; 
	var i = 0; 
	while (i < 20) {
		text += "<br> The number is " + i;
		i++;
	} 
	document.getElementById("demo").innerHTML = text;
	}
	</script>
	
	</body>
</html>

// Variant, do loop, code block will always be executed at least once

<script>
function myFunction() {
    var text = ""
    var i = 0;
    do {
        text += "<br>The number is " + i;
        i++;
    }
    while (i < 10)  
    document.getElementById("demo").innerHTML = text;
}
</script>