lodash/test/isArrayLike.spec.ts

import assert from 'node:assert';
import lodashStable from 'lodash';
import { args, stubTrue, falsey, asyncFunc, genFunc, slice, symbol, realm } from './utils';
import isArrayLike from '../src/isArrayLike';

describe('isArrayLike', () => {
    it('should return `true` for array-like values', () => {
        const values = [args, [1, 2, 3], { '0': 'a', length: 1 }, 'a'],
            expected = lodashStable.map(values, stubTrue),
            actual = lodashStable.map(values, isArrayLike);

        assert.deepStrictEqual(actual, expected);
    });

    it('should return `false` for non-arrays', () => {
        const expected = lodashStable.map(falsey, (value) => value === '');

        const actual = lodashStable.map(falsey, (value, index) =>
            index ? isArrayLike(value) : isArrayLike(),
        );

        assert.deepStrictEqual(actual, expected);

        assert.strictEqual(isArrayLike(true), false);
        assert.strictEqual(isArrayLike(new Date()), false);
        assert.strictEqual(isArrayLike(new Error()), false);
        assert.strictEqual(isArrayLike(asyncFunc), false);
        assert.strictEqual(isArrayLike(genFunc), false);
        assert.strictEqual(isArrayLike(slice), false);
        assert.strictEqual(isArrayLike({ a: 1 }), false);
        assert.strictEqual(isArrayLike(1), false);
        assert.strictEqual(isArrayLike(/x/), false);
        assert.strictEqual(isArrayLike(symbol), false);
    });

    it('should work with an array from another realm', () => {
        if (realm.object) {
            const values = [realm.arguments, realm.array, realm.string],
                expected = lodashStable.map(values, stubTrue),
                actual = lodashStable.map(values, isArrayLike);

            assert.deepStrictEqual(actual, expected);
        }
    });
});