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Re: question for perl book & magazine authors

by Tanktalus (Canon)
on Oct 20, 2005 at 03:42 UTC ( #501527=note: print w/replies, xml ) Need Help??


in reply to question for perl book & magazine authors

As to the question of grep and map being used as much as they could, I couldn't agree more. At work, I've had to train a few people to use them instead of foreach when they made sense ... and then untrain them a bit when they started using them where they didn't make sense. The point isn't to religiously worship them, but to make your code do what it says: if you're converting one list into another, you're mapping from one to the other. If you're finding elements in a list, you're grepping for them.

By speaking idiomatically perl, you may get a speed benefit (as you did in your benchmark), but, more importantly, you get a maintenance benefit: your code looks like a design document!

That is actually part of the reason why I don't like map's and grep's used in void context - they are no longer reading like plain English. "Map from @common to ... nothing?" Instead, just use for/foreach: "For each element in @common, do..." That reads like exactly the solution you're attempting to do. Which is probably how you're thinking of the problem - and, any time your can code your solution in the domain of the problem instead of the domain of the solution, you're going to end up with clearer and more flexible code.

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[ambrus]: Today I accidentally cut my hand while carrying a computer. On the display part of the motherboard that sticks out at the back of the chasis and has ports, there's this thin metal sheet with holes cut for the ports, to guide plugs into the sockets.
[ambrus]: This sheet has sharp needle-like parts, 0.004 long and less than 0.001 wide, that can get bent to point outwards, and one of these cut into my palm when I lifted the box.
[ambrus]: So now when I choose what motherboard to buy for my new home computer, I have one more specific property to guide me. Useful, because there's so many different boards to choose from.

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