endsWith in JavaScript

Question

How can I check if a string ends with a particular character in JavaScript?

Example: I have a string

var str = \"mystring#\";

I wa

Answer 1

A way to future proof and/or prevent overwriting of existing prototype would be test check to see if it has already been added to the String prototype. Here's my take on the non-regex highly rated version.

if (typeof String.endsWith !== 'function') {
    String.prototype.endsWith = function (suffix) {
        return this.indexOf(suffix, this.length - suffix.length) !== -1;
    };
}