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JavaScript - how to replace element in array?

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In JavaScript it is not intuitive at first time how to replace element in array. Replace operation can be achieved with Array.prototype.splice method. This article is focused on how to do it.

1. Replace element with Array.prototype.splice method example

// ONLINE-RUNNER:browser;

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

// removing element on 1st index position 
// and inserting 'replaced item' element on same position
array.splice(1, 1, 'replaced item');

console.log(array);

Output (with NodeJS):

[ 'a', 'replaced item', 'c', 'd' ]

Notes about Array.prototype.splice method:

  • takes as first argument index of replaced element
  • takes as second argument number of removed elements - in this case we remove one element and put on its place new one
  • takes as third argument added element in removed element place

Refrences

  1. Array.prototype.splice method - MDN Docs 

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