diginext-utils/esm/array/flatten.js

README.md

/**
 * Flattens a nested array by one or more levels.
 *
 * @template T - The type of elements in the array
 * @param array - The array to flatten
 * @param depth - The depth level to flatten (default: 1)
 * @returns A new flattened array
 *
 * @example
 * ```ts
 * flatten([1, [2, 3], [4, 5]]); // [1, 2, 3, 4, 5]
 * flatten([1, [2, [3, [4]]]], 2); // [1, 2, 3, [4]]
 * flatten([1, [2, [3, [4]]]], Infinity); // [1, 2, 3, 4]
 * ```
 */
export function flatten(array, depth = 1) {
    if (!Array.isArray(array)) {
        return [];
    }
    if (depth <= 0) {
        return array;
    }
    return array.reduce((acc, item) => {
        if (Array.isArray(item)) {
            acc.push(...flatten(item, depth - 1));
        }
        else {
            acc.push(item);
        }
        return acc;
    }, []);
}
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