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Re^3: Passing multiple arrays to foreach loop

by GrandFather (Sage)
on May 14, 2013 at 10:31 UTC ( #1033444=note: print w/replies, xml ) Need Help??


in reply to Re^2: Passing multiple arrays to foreach loop
in thread Passing multiple arrays to foreach loop

It was not "trouble", and actually not a bad question, but learning to write small test programs to check your understanding is a very useful art. The same art applies when the question grows beyond anything one can answer for oneself, but then the art morphs into being able to create a small focused test script that others can use as a test bed for understanding your issue and providing a solution.

True laziness is hard work
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[Lady_Aleena]: Why does grep(/.*$in.*/, @my_modules) work but grep { $_ =~ /.*$in.*/; $_ } @my_modules not work? What did I do wrong in the second?
[tobyink]: Why are you returning $_ n your grep block? You should return a boolean.
[tobyink]: *in your grep block
[tobyink]: You can use grep { $_ =~ /.*$in.*/; } @my_modules but why not stick to grep(/.*$in.*/, @my_modules)? (The latter is faster.)
[shmem]: Lady_Aleena, in the first example grep evaluates the result from grep and if true, returns $_. In the second, it always returns $_
[shmem]: ..the result from the pattern match
[Lady_Aleena]: tobyink, I did after I failed to get the BLOCK to work. I can't seem to get my brain around grep BLOCK, though I'm okay with grep EXPR.

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