In some of my more recent posts about How to compare arrays in Javascript and Format Numbers as Currency with Javascript I have been enjoying adding them as extension methods to simplify their usage.
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:
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 Hopefully with these two examples this will now become second nature to your Javascript code as it is quickly becoming mine! Published on Jun 26, 2022 Tags: JavaScript
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Jamie Munro is the author of ASP.NET MVC 5 with Bootstrap and Knockout.js,
Knockout.js: Building Dynamic Client-Side Web Applications,
20 Recipes for Programming MVC 3,
and 20 Recipes for Programming PhoneGap. He has been developing websites and web applications for over 20 years. Jamie began his writing career in 2009. As the success of Jamie's blog grew, he turned his writing passion to books about web development in hopes that his many years of experience could be passed on to his readers. No matter the programming language you're looking to learn, I've hopefully compiled an incredible set of tutorials for you to learn; whether you are beginner
or an expert, there is something for everyone to learn. Each topic I go in-depth and provide many examples throughout. I can't wait for you to dig in
and improve your skillset with any of the tutorials below.
// 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];
});
}
// Extend the number property
Number.prototype.currency = function(locale, isoCode) {
var formatter = new Intl.NumberFormat(locale, { style: 'currency', currency: isoCode });
return formatter.format(this);
}
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