How to write Extensible methods in JavaScript

Question

I need to write a method I will call on a string literal in JavaScript. A method that I want to call:

"Javascript".toKampala();

Does that feature exist in JavaScript? and if it does How do I write such a method (toKampala()) on a JavaScript literal or any object?

In Kotlin I did it like this;

fun String.toHenry():String{
    return "$this Henry";
}

and I can call

"chalres".toHenry()

Henry, please do some research before asking a question on Stack Overflow. By searching for your question's title in google, I the answer could be found in the first search result. — Cerbrus, Oct 11 '17 at 07:20
I did But maybe I was using the same word like in the heading — henrybbosa, Oct 11 '17 at 07:22
I literally copy-pasted _"How to write Extensible methods in javacript"_ into google to find these 2 dupe targets... — Cerbrus, Oct 11 '17 at 07:23
I actullay wanted to know if that method workes on all javascript objects — henrybbosa, Oct 11 '17 at 07:24
Depends on who you ask. Generally, as long as you know what you're doing, you'll be fine. — Cerbrus, Oct 11 '17 at 07:28

Suren Srapyan · Accepted Answer · 2017-10-11T07:17:57.843

1

Every string is default has a prototype, which is the String.prototype object and it can access anything which are defined there.

You need add that method in the String.prototype and it will be accessible from any string. You can access the current string in that function by this.

String.prototype.toHenry = function() {
  return this + ' Hentry';
};

console.log('charles'.toHenry());

edited Oct 11 '17 at 07:17

answered Oct 11 '17 at 07:16

Suren Srapyan

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please give a small example – henrybbosa Oct 11 '17 at 07:17
@henrybbosa See it – Suren Srapyan Oct 11 '17 at 07:18
Please don't answer obvious duplicates like these. Close them as a duplicate instead Answering them disqualifies the (closed) duplicate from being [automatically deleted](https://stackoverflow.com/help/roomba), and the answer only serves to further divide where information can be found. – Cerbrus Oct 11 '17 at 07:26

How to write Extensible methods in JavaScript

1 Answers1