Dynamic property names for loop of object Javascript

Question

In Javascript is there a clever way to loop through the names of properties in objects in an array?

I have objects with several properties including guest1 to guest1

Answer 1

Try this:

for (var i = 0; i < results.length; i++) {
    for (var j=0; j <= 100; j++){
        if (results[i]["guest" + j] != "") {
            Do something;
        }
    }
}

Answer 2

I think you'll find useful the "in" operator:

if (("guest" + i) in results[i]) { /*code*/ } 

Cheers

Answer 3

Access properties by constructing string names in the [] object property syntax:

// inside your results[i] loop....
for (var x=1; x<=100; x++) {
  // verify with .hasOwnProperty() that the guestn property exists
  if (results[i].hasOwnProperty("guest" + x) {
     // JS object properties can be accessed as arbitrary strings with []
     // Do something with results[i]["guest" + x]
     console.log(results[i]["guest" + x]);
  }
}