javascript - iterating through object

Question

I'm having a really hard time trying to find a way to iterate through this object in the way that I'd like. I'm using only Javascript here.

First, here's the object

{
"dialog":
{
    "dialog_trunk_1":{
        "message": "This is just a JSON Test"
    },
    
    "dialog_trunk_2":{
        "message": "and a test of the second message"
    },

    "dialog_trunk_3":
    {
        "message": "This is a test of a bit longer text. Hopefully this will at the very least create 3 lines and trigger us to go on to another box. So we can test multi-box functionality, too."
    }
}
}

Right now, I'm just trying basic ways to get through to each dialog_trunk on this object. I ideally want to loop through the object and for each trunk, display it's message value.

I've tried using a for loop to generate the name/number of the dialog_trunk on the fly, but I can't access the object using a string for the object name so I'm not sure where to go from here.

Answer 1

You use a for..in loop for this. Be sure to check if the object owns the properties or all inherited properties are shown as well. An example is like this:

var obj = {a: 1, b: 2};
for (var key in obj) {
  if (obj.hasOwnProperty(key)) {
    var val = obj[key];
    console.log(val);
  }
}

Or if you need recursion to walk through all the properties:

var obj = {a: 1, b: 2, c: {a: 1, b: 2}};
function walk(obj) {
  for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
      var val = obj[key];
      console.log(val);
      walk(val);
    }
  }
}
walk(obj);