Array vs set in JavaScript

Jun 9, 20200 likes92 views

This document compares and contrasts arrays and sets in JavaScript. It notes that sets do not allow duplicate values, while arrays do. Items in an array can be accessed using indexes, but items in a set cannot. The document also provides an example of using a set to remove duplicate values from an array in one line of code.

const myArr = [1, 2, 3];
console.log(myArr[0]);
// Output: 1
const mySet
= new Set([1, 2, 3]);
console.log(mySet[0]);
// undefined
const arr1 = [1,2,3,3];
// Initializes an array with
4 items
const set1 = new Set(
[1, 2, 3, 3]
); // Initializes with 3
items
// method 1
var arr1 = [ ];
// method 2
var arr2 = new array();
// Initializes an empty set
const set1 = new Set();
// Initialize with value
const set2 = new Set([1, 2,
3]);
Initialize a set
Duplicate values are not allowed
Items can be accessed using index Items cannot be accessed using index
Initialize an array
Duplicate values are allowed
VSARRAY SET
[🍎, 🍎, 🍐, 🍐, 🍊] [🍎,🍎, 🍐, 🍐, 🍊] [🍎, 🍎, 🍐, 🍐, 🍊] [🍎, 🍐, 🍊]

By combining features of array and a set in
javascript, we get more powerful code.
Example
Easy shortcut to remove duplicates from an array
Brought to you by Ideas2IT
TRICKS TO REMOVE
DUPLICATES FROM ARRAY
// array with duplicates
let array1 = [1,1,2,2,3,3,4,4];
// create a Set with array
let array2 = Array.from(new Set(array1));
console.log(array2); // [ 1, 2, 3, 4 ]

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Array vs set in JavaScript

1. const myArr = [1, 2, 3]; console.log(myArr[0]); // Output: 1 const mySet = new Set([1, 2, 3]); console.log(mySet[0]); // undefined const arr1 = [1,2,3,3]; // Initializes an array with 4 items const set1 = new Set( [1, 2, 3, 3] ); // Initializes with 3 items // method 1 var arr1 = [ ]; // method 2 var arr2 = new array(); // Initializes an empty set const set1 = new Set(); // Initialize with value const set2 = new Set([1, 2, 3]); Initialize a set Duplicate values are not allowed Items can be accessed using index Items cannot be accessed using index Initialize an array Duplicate values are allowed VSARRAY SET [🍎, 🍎, 🍐, 🍐, 🍊] [🍎,🍎, 🍐, 🍐, 🍊] [🍎, 🍎, 🍐, 🍐, 🍊] [🍎, 🍐, 🍊]

2. By combining features of array and a set in javascript, we get more powerful code. Example Easy shortcut to remove duplicates from an array Brought to you by Ideas2IT TRICKS TO REMOVE DUPLICATES FROM ARRAY // array with duplicates let array1 = [1,1,2,2,3,3,4,4]; // create a Set with array let array2 = Array.from(new Set(array1)); console.log(array2); // [ 1, 2, 3, 4 ]

Array vs set in JavaScript

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