Tutorials - JavaScript - Loops - The WHILE Loop

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Loops - The while Loop

Tutorials > JavaScript > Loops - The WHILE Loop

What are Loops?

Often you may need to execute the same block of code several times consecutively. Loops provide a convenient structure in which to do this.

The while Loop

A while loop takes the form:

while (condition) {
    //Do something.
}

The condition is a JavaScript statement which evaluates to true or false. A simple example:

var i=0;

while(i<5) {
    document.write(i + "<br/>");
    i++;    //Add 1 to 'i'
}

This produces the output:

1
2
3
4
5

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