JavaScript Array fill() Method

February 8, 2021 10:45 am IST

You are Here:

JavaScript Array fill() Method

The fill() method fills (modifies) all the elements of an array from a start index to an end index with a static value.

Note: This method overwrites the original array.

Fill All Elements in an Array

In the following example, we will omit the start index and end value to fill all the elements in an array.

Example

HTML Online Editor

<!DOCTYPE html> <html> <body> <script> var myNumber = [1, 2, 3, 4, 5, 6, 7]; var result = []; //fill with * result = myNumber.fill("*"); document.write(result); </script> </body> </html>

Run

Syntax

Array.fill(value, start, end)

Parameter Values

Value	Type	Explanation
value	Required	Specifies a value to fill an array.
start	Optional	Specifies the starting position. If start is omitted, the default value is 0.
end	Optional	Specifies the ending position. If end is omitted, the default value is the length of an array.

Fill Specific Elements in an Array

In the following example, we will specify the start index and end value to fill specific elements in an array.

Example

HTML Online Editor

<!DOCTYPE html> <html> <body> <script> var myNumber = [1, 2, 3, 4, 5, 6, 7]; var result = []; //fill with * result = myNumber.fill("*", 3, 5); document.write(result); </script> </body> </html>

Run