How Can I Efficiently Retrieve JavaScript Object Property Names?

Retrieving Object Property Names in JavaScript

To efficiently list the property names of a JavaScript object, we have several options available.

Object.keys() Method (Modern Browsers)

For browsers with up-to-date support (i.e., IE9 , FF4 , Chrome5 , Opera12 , Safari5 ), the built-in Object.keys() method provides a straightforward solution:

var keys = Object.keys(myObject);

Simplified Polyfill for Object.keys()

If Object.keys() is unavailable, this simplified polyfill can be used:

var getKeys = function(obj) {
   var keys = [];
   for (var key in obj) {
      keys.push(key);
   }
   return keys;
};

var keys = getKeys(myObject);

Extending Object.prototype with .keys() (Not Recommended)

As an alternative, you can extend the Object.prototype to add a .keys() method, but this approach has potential side effects:

Object.prototype.keys = function() {
   var keys = [];
   for (var key in this) {
      keys.push(key);
   }
   return keys;
};

var keys = myObject.keys();

With these methods, you can conveniently obtain a list of property names, such as ["ircEvent", "method", "regex"] for the provided object.

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