how to loop through the index of an array code example

Example 1: javascript code to loop through array

var colors = ["red","blue","green"];
for (var i = 0; i < colors.length; i++) {
    console.log(colors[i]);
}

Example 2: javascript best way to loop through array

var len = arr.length;
while (len--) {
    // blah blah
}