[Tutor] map() and lambda to change class instance attribute (fwd)

[Bernard Lebel]

The authors even go as far as saysing, on page 228 (first paragraph)
that map() used that way has a performance benefit and is faster than
a for loop.


Cheers
Bernard



On 5/13/05, Alan Gauld <alan.gauld at freenet.co.uk> wrote:

> How bizarre. I'm astonished that Lutz/Ascher even show that as a means
> of changing an attribute. As Danny said, it's definitely an abuse of
> map,
> and there is no advantage whatsoever, as far as I can see. In fact I
> suspect that it's actually slower than an explicit loop (because of
> the extra list building).
> 
> > However I was looking into lambdas in hope to eliminate the need to
> > define a function.
> 
> And a loop also avoids the need for a function, and therefore for
> a function call, which is another reason the map should be slower.
> 
> Its completely weird that a text book should even suggest that map
> be used for this!
> 
> Alan G
> Author of the Learn to Program web tutor
> http://www.freenetpages.co.uk/hp/alan.gauld
> 
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