Rediscovering JavaScript: ES6, ES7 & ES8/

...

/

Solution Review: Injecting Multiple Properties

Solution Review: Injecting Multiple Properties

Let's learn the solution to the injecting multiple properties challenge.

We'll cover the following...

Solution

Let’s start understanding the solution code.

Node.js
'use strict';
Object.defineProperties(Number.prototype, {
  integerPart: {
    get: function() {
      return this.toString().split('.')[0];
    }
  },
  fractionalPart: {
    get: function() { return this.toString().split('.')[1] || 0; }
  }
});                            
const printParts = function(number) {
  return `whole: ${number.integerPart} decimal: ${number.fractionalPart}`;
};
console.log(printParts(22.12));    //whole: 22 decimal: 12
console.log(printParts(.14));      //whole: 0 decimal: 14
console.log(printParts(-23.19));   //whole: -23 decimal: 19
console.log(printParts(42));       //whole: 42 decimal: 0

Explanation

For injection properties, we use a special defineProperties method. The defineProperties() method takes only two parameters:

  1. The candidate object for injection
  2. An object with properties as
...