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JavaScript - how to remove many elements form array by index?

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

1. Remove elements 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, 2 elements
var removedElements = array.splice(1, 2);

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

Output (with NodeJS):

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

Notes about Array.prototype.splice method:

  • takes¬†as first argument index of remved element
  • takes as second argument number of removed elements
  • 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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