5kyu_InterleavingArrays.js

// 5kyu - Interleaving Arrays

// Create a function, that accepts an arbitrary number of arrays and returns a single array generated by alternately appending elements from the passed in arguments. If one of them is shorter than the others, the result should be padded with empty elements.

// Examples:

// interleave([1, 2, 3], ["c", "d", "e"]) === [1, "c", 2, "d", 3, "e"]
// interleave([1, 2, 3], [4, 5]) === [1, 4, 2, 5, 3, null]
// interleave([1, 2, 3], [4, 5, 6], [7, 8, 9]) === [1, 4, 7, 2, 5, 8, 3, 6, 9]
// interleave([]) === []

function interleave() {
    let bool = true, res = [], ct = 0;
    const arr = [...arguments];
    while (bool) {
        bool = false;
        arr.forEach(arr => {
            let arrValue;
            if (typeof arr[ct] !== 'undefined') {
                arrValue = arr[ct];
                bool = true;
            } else
                arrValue = null;
            res.push(arrValue);
        });
        ct++;
    }
    return res.splice(0, res.length - arguments.length);
}