Sometimes it's useful for reflection purposes to retrieve all the properties contained within a given class. Unfortunately, JavaScript doesn't have a native method for that purpose so we have to create one from scratch. For example, given the following class:
function Class() {
this.foo = 'Foo';
this.bar = 'Bar';
this.baz = 'Baz';
}
we can write such a method as follows:
Class.prototype = {
constructor: Class,
getProperties: function() {
var properties = [];
for(var i in this) {
if(typeof this[i] !== 'function') {
properties.push(this[i]);
}
}
return properties;
}
}
This method simply iterates over its own class and stores all property values in an array. A simple test:
var myClass = new Class();
var props = myClass.getProperties();
for(var i=0; i<props.length; i++) {
alert(props[i]); //'Foo', 'Bar', 'Baz'
}
Very simple.