var twoSum = function(nums, target) {
    var obj = {}
    var i = 0
    var res = []
    while (i < nums.length) {
        if(obj[target - nums[i]] !== undefined) {
            res.push(obj[target - nums[i]])
            res.push(i)
        } else {
            obj[nums[i]] = i
        }
        i++
    }
    return res
};