Re: grep usage confusion

my @index2 = grep($_ ne "fourthy", @coins);

I guess you meant

my @index2 = grep {$_ ne "fourthy"} @coins);
[download]

my @index2 = grep('$_ ne "fourthy"', @coins);
[download]

because in the way you have written it, it would not work (grep needs to eval the first argument (block or string) repeatedly for each item in the argument list).

--
Ronald Fischer <ynnor@mm.st>

Comment on Re: grep usage confusion Select or Download Code

Replies are listed 'Best First'.
Re^2: grep usage confusion (eval) by tye (Sage) on Oct 14, 2008 at 18:07 UTC
No, grep doesn't eval strings of Perl code. You can give it a block or you can give it an expression (not a string). Your first example does the same thing as the original code (which does work) while your second example returns all of @coins since the string `'$_ ne "fourthy"'` is a true value. - tye	[reply] [d/l]
Re^3: grep usage confusion (eval) by rovf (Priest) on Oct 15, 2008 at 08:33 UTC
grep doesn't eval strings of Perl code. Oops, you are right! My mistake! as the original code (which does work) Thanks for pointing that out. Interesting. I was not aware of that usage of `grep` (always used it with a block). -- Ronald Fischer <ynnor@mm.st>	[reply] [d/l]