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Version: 3.28.0

Array.prototype.push()

The push() method adds one or more elements to the end of an array and returns the new length of the array.

Syntax​

push(element0)
push(element0, element1)
push(element0, element1, /* … ,*/ elementN)

Parameters​

  • elementN
    • : The element(s) to add to the end of the array.

Return value​

The new Array.prototype.length property of the object upon which the method was called.

Description​

The push() method appends values to an array.

Array.prototype.unshift()has similar behavior to push(), but applied to the start of an array.

The push() method is a mutating method. It changes the length and the content of this. In case you want the value of this to be the same, but return a new array with elements appended to the end, you can use arr.concat([element0, element1, /* ... ,*/ elementN]) instead. Notice that the elements are wrapped in an extra array — otherwise, if the element is an array itself, it would be spread instead of pushed as a single element due to the behavior of concat().

The push() method is generic. It only expects the this value to have a length property and integer-keyed properties. Although strings are also array-like, this method is not suitable to be applied on them, as strings are immutable.