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combination-sum

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	`1`	`+/**`
	`2`	`+ * @param {number[]} candidates`
	`3`	`+ * @param {number} target`
	`4`	`+ * @return {number[][]}`
	`5`	`+ */`
	`6`	`+function combinationSum(`
	`7`	`+ candidates,`
	`8`	`+ target,`
	`9`	`+ solution = [],`
	`10`	`+ current = [],`
	`11`	`+ currentSum = 0,`
	`12`	`+ index = 0,`
	`13`	`+) {`
	`14`	`+ if (currentSum === target) {`
	`15`	`+ solution.push(current);`
	`16`	`+ }`
	`17`	`+`
	`18`	`+ let candidate = candidates[index];`
	`19`	`+ let newSum = currentSum + candidate;`
	`20`	`+`
	`21`	`+ if (newSum <= target) {`
	`22`	`+ combinationSum(candidates, target, solution, current.concat(candidate), newSum, index);`
	`23`	`+ } else if (index < candidates.length - 1) {`
	`24`	`+ const newIndex = index + 1;`
	`25`	`+ while (currentSum + candidates[newIndex] > target) current.pop();`
	`26`	`+ candidate = candidates[newIndex];`
	`27`	`+ newSum = currentSum + candidate;`
	`28`	`+ combinationSum(candidates, target, solution, current.concat(candidate), newSum, newIndex);`
	`29`	`+ }`
	`30`	`+`
	`31`	`+`
	`32`	`+ return solution;`
	`33`	`+}`
	`34`	`+`
	`35`	`+module.exports = combinationSum;`

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	`1`	`+const combinationSum = require('./combination-sum.js');`
	`2`	`+`
	`3`	`+describe('combinationSum', () => {`
	`4`	`+ it('should return empty', () => {`
	`5`	`+ expect(combinationSum([], 0)).toEqual([[]]);`
	`6`	`+ });`
	`7`	`+});`

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