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Rediscovering JavaScript: ES6, ES7 & ES8

Solution Review: Injecting a Method

Learn to inject methods dynamically by combining sets in JavaScript through loops and Set.add(), enabling efficient member injection. This lesson helps you understand metaprogramming techniques to manipulate objects and achieve dynamic behavior.

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Solution

Let’s take a look at the solution code given below.

Node.js
'use strict';
Set.prototype.combine = function(otherSet) {
  const copyOfSet = new Set(this);
  
  for(const element of otherSet) {
    copyOfSet.add(element);
  }
  
  return copyOfSet;
};
const names1 = new Set(['Tom', 'Sara', 'Brad', 'Kim']);
const names2 = new Set(['Mike', 'Kate']);
const combinedNames = names1.combine(names2);

Explanation

Let’s dive into the solution code.

First of all, we need to make a new Set element in which there will be a combination of two sets. ...