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JavaScript - how to remove element form array by index?

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Created by:
Marcin
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In JavaScript it is not intuitive at first time how to remove element by index. Remove element by index operation can be achieved with Array.prototype.splice method. This article is focused on how to do it.

1. Remove element by index with Array.prototype.splice method example

// ONLINE-RUNNER:browser;

//  index:    0    1    2    3
var array = ['a', 'b', 'c', 'd'];

// removing sice 1st index , 1 element
var removedElements = array.splice(2, 1);

console.log(array);
console.log(removedElements);

Output (with NodeJS):

[ 'a', 'b', 'd' ]
[ 'c' ]

Notes about Array.prototype.splice method:

  • takes¬†as first argument index of remved element
  • takes as second argument number of removed elements - it means it is possible to remove many elements during same operation
  • modifies array by removing elements and returns them as array of removed elements

Refrences

  1. Array.prototype.splice method - MDN Docs 

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