Extending JS

Extending JavaScript

For an traditional function, this does yes reference the given string object so it will yes work for our case.

/** Traditional function have strong support for 'this', which
	we need here as we can see.
	Arrow functions do not have strong support for 'this'.
Thus we choose to use a traditional function here.*/
String.prototype.capitalized = function() {
    /*Notes --
		charAt is "soft" i.e. will return empty string for bad index
		slice() is also loose, e.g. (''.slice(1000)) returns '')*/
    return this.charAt(0).toUpperCase() + this.slice(1);
}

Using Extension

Using an extension is simple -- the extension is used just like any other method.

We just need to import (require) the source.

//Import file so that extensions are loaded
require('./extending-javascript-base-code');

console.log('boot'.capitalized());

Arrow Function Does Not Work

For an arrow function, this does not reference the given string object so will not work for our case.

String.prototype.capitalized = () => {
    /*Notes --
		charAt is "soft" i.e. will return empty string for bad index
		slice() is also loose, e.g. (''.slice(1000)) returns '')*/
    return this.charAt(0).toUpperCase() + this.slice(1);
};