es-toolkit/dist/array/toFilled.js

A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

//#region src/array/toFilled.ts
/**
* Creates a new array filled with the specified value from the start position up to, but not including, the end position.
* This function does not mutate the original array.
*
* @template T - The type of elements in the original array.
* @template U - The type of the value to fill the new array with.
* @param arr - The array to base the new array on.
* @param value - The value to fill the new array with.
* @param [start=0] - The start position. Defaults to 0.
* @param [end=arr.length] - The end position. Defaults to the array's length.
* @returns The new array with the filled values.
*/
function toFilled(arr, value, start = 0, end = arr.length) {
	const length = arr.length;
	const finalStart = Math.max(start >= 0 ? start : length + start, 0);
	const finalEnd = Math.min(end >= 0 ? end : length + end, length);
	const newArr = arr.slice();
	for (let i = finalStart; i < finalEnd; i++) newArr[i] = value;
	return newArr;
}
//#endregion
exports.toFilled = toFilled;