import QtQuick 2.6

Item {
      Component.onCompleted: {
          function underscoreFind(obj, predicate, context) {
              var findIndex = function(obj, predicate, context) {
                  for (var i = 0; i < obj.length; i++) {
                      if (predicate(obj[i])) {
                          return i;
                      }
                  }
                  return -1;
              }

              var key = findIndex(obj, predicate, context)
              console.log("type of KEY " + (typeof key))
              console.log("KEY IS " + key)
              console.log("OBJ KEY IS " + obj[key])
              var keycheck = (key !== void 0 && key !== -1)
              if (key !== void 0 && key !== -1) {
                  console.log("#1 EVALUATING AS TRUE")
              } else{
                  console.log("#1 EVALUATING AS  FALSE")
              }
              if (keycheck) {
                  console.log("#2 EVALUATING AS TRUE")
              } else{
                  console.log("#2 EVALUATING AS  FALSE")
              }
         }
         underscoreFind([,,5], function(obj){return obj !== undefined })
     }
  }