Lesson 7 : Replacing casting operator ( ) with 'as' operator

[Paul]

In Lesson 7, in the CategorizedProductManager.mxml, in function
prodByCategoryHandler, when creating the Product object, instead of
using the casting operator ( ) , I use the 'as' operator.

This caused the categorizedProducts to be filled with null values with
no error.

I did abit of check in the differences between using ( ) or 'as' and
it tells me that using 'as' is recommended since it doesn't throws any
TypeError but fill the Product object with default values for the
relevant type, whereas using ( ) will throw a TypeError if flex fails
to parse the data.

I would like to know whether the 'as' operator is easily switchable
with the ( ) operator when doing casting.

Thanks in advance.

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[Michael Labriola]

If you are just casting the two methods are identical. However, the as
method is just a cast not a conversion

'3' as Number will fail because '3' is a string
Number( '3' ) will work because it is casting and converting

Also, that latter syntax is often confused with object creation..
there is a huge difference between

new Product( .... ) and
Product( ... )

Mike