Untitled

<!DOCTYPE html>
<html>

<head>
    <title>js test</title>
</head>

<body>
    <script>
        function conditionalLoop(arr) {
            var s = null;
            if(arr.length === 1) {
                s = arr[0];
            } else if (arr.length > 1) {
                for (var i=0; i<arr.length; i++) {
                    s = arr[i];
                }
            }

            return s;
        }

        function alwaysLoop(arr) {
            var s = null;
            if (arr.length > 0) {
                for (var i=0; i<arr.length; i++) {
                    s = arr[i];
                }
            }

            return s;
        }

var iterations = 1000000;
console.time('conditionalLoop with one element');
for(var i = 0; i < iterations; i++ ){
    conditionalLoop([2]);
};
console.timeEnd('conditionalLoop with one element');

console.time('alwaysLoop with one element');
for(var i = 0; i < iterations; i++ ){
    alwaysLoop([2]);
};
console.timeEnd('alwaysLoop with one element');

console.time('conditionalLoop with two elements');
for(var i = 0; i < iterations; i++ ){
    conditionalLoop([2, 3]);
};
console.timeEnd('conditionalLoop with two elements');

console.time('alwaysLoop with two elements');
for(var i = 0; i < iterations; i++ ){
    alwaysLoop([2, 3]);
};
console.timeEnd('alwaysLoop with two elements');
    </script>
</body>

</html>