JavaScript Array fill()

Fill all the elements with a value:

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.fill("Kiwi");

Fill the last two elements:

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.fill("Kiwi", 2, 4);

Description

The fill() method fills specified elements in an array with a value.

The fill() method overwrites the original array.

Start and end position can be specified. If not, all elements will be filled.

array.fill(value, start, end)

Parameter	Description
value	Required. The value to fill in.
start	Optional. The start index (position). Default is 0.
end	Optional. The stop index (position). Default is array length.

Type	Description
Array	The filled array.

fill() is an ECMAScript6 (ES6) feature.

ES6 (JavaScript 2015) is supported in all modern browsers since June 2017:


Chrome 51	Edge 15	Firefox 54	Safari 10	Opera 38
May 2016	Apr 2017	Jun 2017	Sep 2016	Jun 2016

fill() is not supported in Internet Explorer.