Javascript Freecodecamp Algorithm #30: Pairwise

pairwise.js

function pairwise(arr, arg) {
  const usedDict = {};

  let output = 0;
  for (let i = 0; i < arr.length - 1; i++) {
    if (usedDict[i]) {
      continue;
    }
    const iVal = arr[i];

    for (let j = i + 1; j < arr.length; j++) {
      if (usedDict[j]) {
        continue;
      }

      const jVal = arr[j];
      if (iVal + jVal === arg) {
        usedDict[i] = true;
        usedDict[j] = true;
        output += i + j;
        break;
      }
    }
  }
  return output;
}