Usage

first([1, 2, 3, 4]);
// 1

first([], 0);
// 0

Installation

CLI

npx atmx add helper first

Manually

Copy and paste the following method into @/utils/helpers/undefined.ts:

/**
* Get the first item in an array or a default value.
*
* @example
* first([1, 2, 3, 4])
* // 1
*
* first([], 0)
* // 0
*/
export function first<T>(array: readonly T[]): T | undefined;

export function first<T, U>(array: readonly T[], defaultValue: U): T | U;

export function first(array: readonly unknown[], defaultValue?: unknown) {
return array?.length > 0 ? array[0] : defaultValue;
}