toFilled

Creates a new array by filling part or all of it with the specified value.

const filled = toFilled(arr, value, start?, end?);

Reference

toFilled(arr, value, start?, end?)

Use toFilled when you want to fill a specific range of an array with a specified value. It creates and returns a new array without modifying the original array.

import { toFilled } from 'es-toolkit/array';

const array = [1, 2, 3, 4, 5];

// Fill with '*' from index 2 to the end.
toFilled(array, '*', 2);
// Returns: [1, 2, '*', '*', '*']

// Fill with '*' from index 1 to before index 4.
toFilled(array, '*', 1, 4);
// Returns: [1, '*', '*', '*', 5]

If you omit the start and end positions, it fills the entire array.

import { toFilled } from 'es-toolkit/array';

const array = [1, 2, 3, 4, 5];

toFilled(array, '*');
// Returns: ['*', '*', '*', '*', '*']

You can also use negative indices. They count from the end of the array.

import { toFilled } from 'es-toolkit/array';

const array = [1, 2, 3, 4, 5];

// Fill with '*' from 4th from the end to before 1st from the end.
toFilled(array, '*', -4, -1);
// Returns: [1, '*', '*', '*', 5]

Parameters

• arr (T[]): The original array to base on.
• value (U): The value to fill the array with.
• start (number, optional): The start position for filling. Default is 0.
• end (number, optional): The end position for filling. Default is the array length.

Returns

(Array<T | U>): Returns a new array with the specified range filled with the value. The original array is not modified.