Find a product within an array of numbers. Demo at http://jsbin.com/zidogenaro/edit?js,console

find-product.js

var mathManager = {
  findProduct: function(product, arr) {
    var result = null;
    
    for (var i=0; i<arr.length; i++) {
      for (var j=i+1; j<arr.length; j++) {
        if (product === arr[i] * arr[j]) {
          result = [arr[i], arr[j]];
          break;
        }
      }
      
      if (result) {
        break;
      }
    }
    
    return result;
  }
};

var arr = [1, 3, 6, 8, 9, 2, 0, 11, 7];
var result = mathManager.findProduct(18, arr);
console.log('Find product 18 in ' + arr);
console.log(result);
console.log(result.length===2 && result.every(function(v,i) { return v === [3,6][i]; }));

result = mathManager.findProduct(19, arr);
console.log('Find product 19 in ' + arr);
console.log(result);
console.log(result === null);

var result = mathManager.findProduct(22, arr);
console.log('Find product 22 in ' + arr);
console.log(result);
console.log(result.length===2 && result.every(function(v,i) { return v === [2,11][i]; }));