diginext-utils/dist/array/difference.js

README.md

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.difference = difference;
/**
 * Creates an array of values from the first array that are not present in the second array.
 *
 * @template T - The type of elements in the arrays
 * @param array1 - Array to check
 * @param array2 - Values to exclude
 * @returns A new array with values from array1 not in array2
 *
 * @example
 * ```ts
 * difference([1, 2, 3, 4], [2, 4]); // [1, 3]
 * difference(['a', 'b', 'c'], ['b']); // ['a', 'c']
 * difference([1, 2], [3, 4]); // [1, 2]
 * ```
 */
function difference(array1, array2) {
    if (!Array.isArray(array1)) {
        return [];
    }
    if (!Array.isArray(array2)) {
        return [...array1];
    }
    const set2 = new Set(array2);
    return array1.filter((item) => !set2.has(item));
}
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