March 5, 2001 - Iterating over an Object's Properties

Yehuda Shiran March 5, 2001
Iterating over an Object's Properties
Tips: March 2001

Yehuda Shiran, Ph.D.
Doc JavaScript

JavaScript provides you with a way to loop over an object's properties. You can use this loop technique to find out the names of an object's properties. The looping is done with a for loop:

for (property in objName)
where objName is the name of your object. In the following example we use the for loop to print ken's employee properties (dept and manager):

function employee() {
  this.dept = "HR";
  this.manager = "John Johnson";
}
var ken = new employee();
function printProp() {
  for (property in ken) {
    alert(property);
  }
}

Try it. You will get two alert boxes: one for dept and one for manager.