Bonfire: Pairwise

bonfire-pairwise.js

// Bonfire: Pairwise
// Author: @clive-bunting
// Challenge: http://www.freecodecamp.com/challenges/bonfire-pairwise
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function pairwise(arr, arg) {
  var used = [];
  for (var i = 0; i < arr.length - 1; i++) {
    if (used.indexOf(i) === -1) {
      for (var j = i + 1; j < arr.length; j++) {
        if (used.indexOf(j) === -1) {
          if (arr[i] + arr[j] === arg) {
            used.push(i, j);
            break;
          }
        }
      }
    }
  }
  var sum = 0;
  used.forEach(function(x) { sum += x; });
  return sum;
}

pairwise([1,4,2,3,0,5], 7);