Combine/merge Dynamic Objects in AS3

I have 2 dyn开发者_如何学Pythonamic objects and I want to build one to contain all the properties:

var o1:Object = {prop1:val1,prop2:val2,prop3:val3};
var o2:Object = {prop3:val3a,prop4:val4};

and I need to obtain a third object that looks like that:

{prop1:val1, prop2:val2, prop3:val3a, prop4:val4};

Basically I need a way to iterate through the object properties and to add new properties to the third object. I have to mention I'm quite new to AS3/Flash/Flex.

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First question, do you really mean to have prop3 in both objects? you will need to decide what to do in case of a collision like that, which object has precedence.

Secondly, check out the introspection apis: http://livedocs.adobe.com/flex/3/html/help.html?content=usingas_8.html

something like this should work:

public function mergeDynamicObjects ( objectA:Object, objectB:Object ) : Object 
{
    var objectC:Object = new Object();

    var p:String;

    for (p in objectA) {
       objectC[p] = objectA[p];
    }

    for (p in objectB) {
       objectC[p] = objectB[p];
    }

    return objectC;
}

If the property exists in A and B, B's will overwrite A's. Also note that if the values of a property is an object, it will pass a reference, not a copy of the value. You might need to clone the object in those cases, depending on your needs.

Note: I haven't actually tested the above, but it should be close. Let me know if it doesn't work.

Updated to fix the errors. Glad it works for you though.

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You can dynamically access/set properties on objects with the index operator. The for loop will itterate over the property names, so if you put it all together, the following test passes:

    [Test]
    public function merge_objects():void {
        var o1:Object = {prop1:"one", prop2:"two", prop3:"three"}; 
        var o2:Object = {prop3:"threeA", prop4:"four"};

        var o3:Object = new Object();

        for (var prop in o1) o3[prop] = o1[prop];
        for (var prop in o2) o3[prop] = o2[prop];

        assertThat(o3.prop1, equalTo("one"));
        assertThat(o3.prop2, equalTo("two"));
        assertThat(o3.prop3, equalTo("threeA"));
        assertThat(o3.prop4, equalTo("four"));
    }

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you can iterate over the object properties like:

var obj1:Object = new Object();
for(var str:String in obj2){
    obj1[str] = "any value"; // insert the property from obj2 to obj1
}