SOURCE

function toRowType (value) {
    const _toString = Object.prototype.toString;
    return _toString.call(value).slice(8, -1);
}

console.log(toRowType(null));
console.log(toRowType({x:1}));
console.log(toRowType([1,2,3,4]));
console.log(toRowType(/123/));
console.log(toRowType());