Honestly, I've always been afraid to do it because it seems "hard". Now that I've done it once though, it is now becoming second nature. I really can't believe I haven't done this before because I absolutely love adding string extensions when I developer with C#.
Let's take a look at some code to add a function with prototype using Javascript. In this first example I will add it to the Javascript Array Prototype:
// Extend the Array property
Array.prototype.equals = function (array2) {
if (!this || !array2)
return false;
if (this.length !== array2.length)
return false;
var array1Sorted = this.slice().sort();
var array2Sorted = array2.slice().sort();
return array1Sorted.every(function(value, index) {
return value === array2Sorted[index];
});
}
The concept for Number is the exact same, you simply replace Array with Number as in the following example. I could see this being used in conjunction with the JavaScript String concat() Method
// Extend the number property
Number.prototype.currency = function(locale, isoCode) {
var formatter = new Intl.NumberFormat(locale, { style: 'currency', currency: isoCode });
return formatter.format(this);
}
Hopefully with these two examples this will now become second nature to your Javascript code as it is quickly becoming mine!
