lodash/test/toArray.spec.ts

import assert from 'node:assert';
import lodashStable from 'lodash';
import { arrayProto, LARGE_ARRAY_SIZE } from './utils';
import toArray from '../src/toArray';

describe('toArray', () => {
    it('should convert objects to arrays', () => {
        assert.deepStrictEqual(toArray({ a: 1, b: 2 }), [1, 2]);
    });

    it('should convert iterables to arrays', () => {
        if (Symbol && Symbol.iterator) {
            const object = { '0': 'a', length: 1 };
            object[Symbol.iterator] = arrayProto[Symbol.iterator];

            assert.deepStrictEqual(toArray(object), ['a']);
        }
    });

    it('should convert maps to arrays', () => {
        if (Map) {
            const map = new Map();
            map.set('a', 1);
            map.set('b', 2);
            assert.deepStrictEqual(toArray(map), [
                ['a', 1],
                ['b', 2],
            ]);
        }
    });

    it('should convert strings to arrays', () => {
        assert.deepStrictEqual(toArray(''), []);
        assert.deepStrictEqual(toArray('ab'), ['a', 'b']);
        assert.deepStrictEqual(toArray(Object('ab')), ['a', 'b']);
    });

    it('should work in a lazy sequence', () => {
        const array = lodashStable.range(LARGE_ARRAY_SIZE + 1);

        const object = lodashStable.zipObject(
            lodashStable.times(LARGE_ARRAY_SIZE, (index) => [`key${index}`, index]),
        );

        let actual = _(array).slice(1).map(String).toArray().value();
        assert.deepEqual(actual, lodashStable.map(array.slice(1), String));

        actual = _(object).toArray().slice(1).map(String).value();
        assert.deepEqual(actual, _.map(toArray(object).slice(1), String));
    });
});