Limiting the times that .split() splits, rather than truncating the resulting array

Question

Really, pretty much what the title says.

Say you have this string:

var theString = \"a=b=c=d\";

Now, when you run theString

Answer 1

const theString = "a=b=c=d";
const [first, ...rest] = theString.split("=");
const second = rest.join("=")
console.log(first, second)

If you are using ECMA 2015, you just need 2 lines.

Answer 2

This my implementation:

String.prototype.splitRemainder = function(delim, count) {
	if (typeof delim !== 'string') {
		return this.split();    
	}

	if (typeof count !== 'number') {
		return this.split(delim);
	}

	if (count < 2) {
		return this.split(delim);
	}

	count--;
	const parts = this.split(delim, count);
	const remainder = this.slice(parts.join('').length + count);

	if (remainder.length > 0) {
		parts.push(remainder);
	}

	return parts;
}

console.log("dasd asds asds asdasd asdasdas".splitRemainder(" ", 4));
console.log("hello-to-you-too".splitRemainder("-",2));

Note that it is not the most efficient way to implement it. So if you're looking for the most efficient solution this is not it.