Object JSON

What number does this code output?

function display() {
        
    let data = 
        {
         "number" : [
          { 
           "result" : "4",
            "result2" : "2"
          },
                     ]
          }
            
    let output = "";

         for (let i in data.number) {
             output += data.number[i].result2;
            }
         document.getElementById("number").innerHTML=output;
        }