reverse an unsigned integer

reverse-unsigned-integer.js

const reverse = (x) => {
	if(x === ''){
		return '';
	} else if(x%10 === 0) {
		x = parseInt(x/10);
		return reverse(x);
	} else if(x < 0) {
		x = -x;
		return reverse(x)*(-1);
	} else {
		x = x + '';
		let newX = reverse(x.substr(1)) + x.charAt(0);
		return parseInt(newX);
	}
}

let x = -123456;
let y = reverse(x);
console.log(y);