ES6 cheatsheet — Helpful array functions

Serban Mihai / 20 October 2018

~1 min read

ES6 array functions

**from**

const inventory = [  
    {name: 'mars', quantity: 2},  
    {name: 'snickers', quantity: 3}  
];  
console.log(Array.from(inventory, item => item.quantity + 2)); // [4, 5]

**of**

Array.of("Twinkle", "Little", "Star"); // returns ["Twinkle", "Little", "Star"]

**find**

const inventory = [  
    {name: 'mars', quantity: 2},  
    {name: 'snickers', quantity: 3}  
];  
console.log(inventory.find(item => item.name === 'mars')); // {name: 'mars', quantity: 2}

**findIndex**

const inventory = [  
    {name: 'mars', quantity: 2},  
    {name: 'snickers', quantity: 3}  
];  
console.log(inventory.findIndex(item => item.name === 'mars')); // 0

**fill** method takes up to three arguments value, start and end. The start and end arguments are optional with default values of 0 and the length of the this object.

[1, 2, 3].fill(1); // [1, 1, 1]  
[1, 2, 3].fill(4, 1, 2); // [1, 4, 3]

You can find a more complete ES6 cheetsheet on my Github page.

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Mihai Serban

ES6 cheatsheet — Helpful array functions