AlgoDaily - Using the Two Pointer Technique

In other words, understand that if arr[pointer_one] < target-arr[pointer_two], it means we should move forward on pointer_one to get closer to where we want to be in magnitude.

This is what it looks like all put together:

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var twoSum = function (arr, target) {
  for (let i = 0, j = arr.length - 1; i < j; ) {
    let sum = arr[i] + arr[j];
    if (sum === target) {
      return [i + 1, j + 1];
    } else if (sum < target) {
      i++;
    } else {
      j--;
    }
  }
};
​
console.log(twoSum([1, 3, 4, 8, 9], 11));

OUTPUT

Results will appear here.