JSFiddle - React, Tailwind, and code Playground

JavaScript

String.prototype.replaceArray = function(find, replace)
{
	var replaceString = this;
	var regex;
	
    for(var i = 0; i < find.length; i++)
	{
		regex = new RegExp(find[i], "g");
		replaceString = replaceString.replace(regex, replace[i]);
	}

	return replaceString;
}

var my_string = ".jpg,.gif,.png";

alert(my_string.replaceArray([".", ","],["",", "]));