Function combinationSum

javascript/0039-combination-sum.js:8–26

(
    candidates,
    target,
    index = 0,
    combination = [],
    combinations = [],
)

 * @return {number[][]}
 */
var combinationSum = function (
    candidates,
    target,
    index = 0,
    combination = [],
    combinations = [],
) {
    const isBaseCase = target < 0;
    if (isBaseCase) return combinations;

    const isTarget = target === 0;
    if (isTarget) return combinations.push(combination.slice());

    for (let i = index; i < candidates.length; i++) {
        backTrack(candidates, target, i, combination, combinations);
    }

    return combinations;
};

const backTrack = (candidates, target, i, combination, combinations) => {
    combination.push(candidates[i]);