const arr = [0, -1, 2, -3, 1];


// [ -3, -1, 0, 1, 2 ]

function triplets(arr) {
	let sorted = arr.sort((a, b) => { return a > b; });
	let answer = [];

	for(p1 = 0; p1 < sorted.length - 2; p1++) {
		let target = -sorted[p1];

		p2 = p1 + 1;
		p3 = sorted.length - 1;

		while(p2 < p3) {
			if((sorted[p2] + sorted[p3]) > target) {
				p3--;
			} else if ((sorted[p2] + sorted[p3]) < target) {
				p2++;
			} else {
				let found = [sorted[p1], sorted[p2], sorted[p3]];
				answer.push(found);

				p2++;
				p3--;
			}
		}
	}

	return answer;
}

console.log(triplets(arr));
console.log(triplets([1, -2, 1, 0, 5]));