lodash/test/fromPairs.spec.ts

import assert from 'node:assert';
import lodashStable from 'lodash';
import { falsey, stubObject, LARGE_ARRAY_SIZE } from './utils';
import fromPairs from '../src/fromPairs';
import toPairs from '../src/toPairs';

describe('fromPairs', () => {
    it('should accept a two dimensional array', () => {
        const array = [
                ['a', 1],
                ['b', 2],
            ],
            object = { a: 1, b: 2 },
            actual = fromPairs(array);

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

    it('should accept a falsey `array`', () => {
        const expected = lodashStable.map(falsey, stubObject);

        const actual = lodashStable.map(falsey, (array, index) => {
            try {
                return index ? fromPairs(array) : fromPairs();
            } catch (e) {}
        });

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

    it('should not support deep paths', () => {
        const actual = fromPairs([['a.b', 1]]);
        assert.deepStrictEqual(actual, { 'a.b': 1 });
    });

    it('should support consuming the return value of `_.toPairs`', () => {
        const object = { 'a.b': 1 };
        assert.deepStrictEqual(fromPairs(toPairs(object)), object);
    });

    it('should work in a lazy sequence', () => {
        const array = lodashStable.times(LARGE_ARRAY_SIZE, (index) => [`key${index}`, index]);

        const actual = _(array).fromPairs().map(square).filter(isEven).take().value();

        assert.deepEqual(actual, _.take(_.filter(_.map(fromPairs(array), square), isEven)));
    });
});