flatten-array

import test from 'tape';

const flattenLoop = (acc, val) => !Array.isArray(val) ? [...acc, val] : val.reduce(flattenLoop, acc);
const flatten = array => flattenLoop([], array);

// TESTS ------------------------------------------------------------

test(`-------- Flatten: testing conversion from multidimensional array to one dimension array`, (assert) => {
    const initialArray = [1, [3, true, [5, 3]], 'aa', [3, 'cc']];
    const expected     = [1, 3, true, 5, 3, 'aa', 3, 'cc'];
    const message      = `${JSON.stringify(initialArray)} should be converted to ${JSON.stringify(expected)}`;

    const actual = flatten(initialArray);

    assert.deepEqual(actual, expected, message);
    assert.end();
});