setarray-xiaoyaoting/setarray-xiaoyaoting.js

function utils(array) {

    var newArray = [];


    function setArray(array, newArray) {

        array.forEach(item => {
            if (item instanceof Array) {
                setArray(item, newArray)
            } else {
                newArray.push(item)
            }

            return newArray
        });
    }

    setArray(array, newArray);

    return newArray
}
console.log(utils([1, [2],
    [3, [
        [4, [6]]
    ]]
]))