Javascript: String starts with snippet

I was surprised to find out that Javascript didn't come with such a function.

It's pretty easy to monkey patch though, it doesn't even need jQuery!

view sourceprint?

1.if (typeof String.prototype.startsWith != 'function') {

2.  String.prototype.startsWith = function (input){

3.    return this.substring(0, input.length) === input

4.  };

5.}

After that you can just use it like any other string function.

view sourceprint?

1.var hash = "#someAnchor";

2. 

3.if (hash.startsWith('#img_')) {

4.  $('a[href="' + hash + '"]').trigger('click');

5.}

Now we've trained Javascript well!

Source

• Javascript StartsWith - Stack Overflow