Object-Oriented JavaScript — Arrays and Functions

Object-Oriented JavaScript — Arrays and Functions

JavaScript is partly an object-oriented language. To learn JavaScript, we got to learn the object-oriented parts of JavaScript. In this article, we’ll look at arrays and functions.

JavaScript is partly an object-oriented language.

To learn JavaScript, we got to learn the object-oriented parts of JavaScript.

In this article, we’ll look at arrays and functions.

ES6 Array Methods

ES6 added more useful array methods.

They provided that were previously provided by 3rd party libraries like Underscore and Lodash.

Array.from

The Array.from method lets us convert iterable objects and non-iterable array-like objects into an array.

For instance, we can use it to convert a NodeList returned from document.querySelectorAll into an array.

We can write:

const divs = document.querySelectorAll('div');
console.log(Array.from(divs));

Then we get an array.

We can also convert objects that have numeric index and a length property into an array.

For example, we can write:

const obj = {
  0: 'a',
  1: 'b',
  length: 2
};
console.log(Array.from(obj));

And we get:

["a", "b"]

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