group array

groupArray.js

const group = (arr = [], length = 2) => {
    if (length > arr.length) return;
    const newArr = arr.slice();
    const returnArr = [];
    while (newArr.length > length) {
        const values = newArr.splice(0, length);
        returnArr.push(values);
    }
    returnArr.push(newArr);
    return returnArr;
};