three-number-sum.js

function threeNumberSum(array, targetSum) {
	const arr = array.sort(function(a, b){
    return a - b;
	});
	const arrLen = array.length;
	const threeNumSum = [];
	console.log(array, targetSum);

	for (let i=0; i < arrLen - 2; i += 1) {
		
		for (let j=i+1; j < arrLen - 1; j += 1) {
			// find third
			for (let k=j+1; k < arrLen; k += 1) {
				
				const rem = targetSum - (arr[i] + arr[j]);
				if (rem === arr[k]) {
					threeNumSum.push([ arr[i], arr[j], arr[k] ]);
				}
			}
		}
	}
	return threeNumSum;
}