JavaScript - Prepend item to array

Add item to front of an array.

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2823

Using Array.prototype.unshift

Add element (or elements) to front of array. The length of the resulting new array is returned.

{{array}}.unshift({{item}})
javascript

Notes

  • Modifies original array.
new length [integer]

last update:

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2897

Unshift array preserving original array

Creates a shallow copy of array and prepends item to the copied array.

{{array}}.slice(0).unshift({{item}});
javascript

Notes

  • Original array remains intact.
  • Slower than version that mutates array.
new length [integer]

last update: