javascript for check for last element code example

Example 1: get last item in array javascript

var colors = ["red","blue","green"];
var green = colors[colors.length - 1]; //get last item in the array

Example 2: js detect end of array

var group = ["a","b","c","d"];
var groupLength = group.length;

while (groupLength--) {
    var item = group[groupLength];

    if(groupLength == 0){
        console.log("Last iteration with item : " + item);
    }
}