Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Re: The Scalar Range Operator

by pg (Canon)
on Jul 27, 2004 at 05:41 UTC ( #377663=note: print w/ replies, xml ) Need Help??


in reply to The Scalar Range Operator

"The condition evaluates false until $left evaluates true. Then the $left condition is ignored, and the condition continues to evaluate true until $right evaluates true, at which point the condition evaluates false, and it goes back to check $left."

Not very precise, and a bit misleading. In the case of "if (2..4)", $left is 2, and $right is 4, both of them always evalutes to true. I know that later you explained that, they were compared to $., and that was right. I suggest you reword this part to make it correct, and agree with other parts of your post.

I think it would be useful to give this example, to explain an interesting situation, which people might run into:

use strict; use warnings; open(FILE, "<", "test.dat"); while (<FILE>) { print if 2 .. 4; } print "=====\n"; open(FILE, "<", "test.dat"); while (<FILE>) { print if 2 .. 4; } ====input==== one two three four five ====output==== two three four =====

This reminds people the fact that $. is not reset when a file is reopened when no explicit close() called in between.


Comment on Re: The Scalar Range Operator
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://377663]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others lurking in the Monastery: (19)
As of 2015-07-06 14:52 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (75 votes), past polls