### Problem:

Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.

Note:
Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c)
The solution set must not contain duplicate triplets.

Example:
Given array = {-1 0 1 2 -1 -4},
Solution set is:
(-1, 0, 1)

(-1, -1, 2)

### JavaScript Code

```function threeSum(num) {
//sort array
num.sort();

var result = [];
var each = [];
for(var i=0; i<num.length; i++){
if(num[i] > 0) break;

for(var j=i+1; j<num.length; j++){
if(num[i] + num[j] > 0 && num[j] > 0) break;

for(var k=j+1; k<num.length; k++){
if(num[i] + num[j] + num[k] == 0) {

each.push(num[i]);
each.push(num[j]);
each.push(num[k]);
result.push(each);
each = [];
}
}
}
}

return result;
}

console.log(threeSum([-1,0,1,2,-1,-4]));
```

1. js code giving duplicate result as [-1, 0, 1] ???

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