> var hash = { a: 1, b: 2 }
>
> $.map( hash, function( val, key ) {
> if( key === 'a')
> return { c: 3, d: 4 };
> else
> return val;
>
> });
>
> And now hash is { c: 3, d: 4, b: 2 }. It doesn't conflict with
> anything.
Can you explain which objects you expect would extend the final
object, and which object would not?
(nodes are objects too)
> Actually, you don't have to differentiate between hashes and sequences
> in js:
>
> if( typeof arr === 'object' )
> for( var key in arr)
>
> For sequences, the key will be 0, 1, 2 and so on. If you want to be
> strict, you can rule out regexps:
>
> if( typeof arr === 'object' && arr.constructor !== RegExp )
This is so wrong.
Maybe you can expect indexes in numerical order for Arrays, but still
Array.prototype is to often extended.
Also we have to iterate like sequence any array-like object (jQuery
objects, NodeLists,...).
.......
>
> > 3. for(var k in obj) newobj[k] = fn(obj[k])
>
> Like I said, it doesn't have the benefit of scoping.
If your argument is scoping, it is not enough.
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