Re: Re^3: [substr] anomaly or mine?

Updated: to correct brainfart!

Actually, I didn't see it that way and was about to suggest that nobody would think twice about using a slice as an rvalue in a list context...~~but decided to try it first...and waddayaknow...~~

 0.04 0.02 >@a = qw(a b c d e)

 0.04 0.02 >print "@a", $/
a b c d e

 0.04 0.02 >@a[1..3] = qw(x y z)

 0.04 0.02 >print "@a", $/
a x y z e

 0.04 0.02 >print @a[1..3] = qw(p q r)
p q r
 0.04 0.02 >print "@a", $/
a p q r e
[download]

So, once I got the syntax right, a slice in a list context does work pretty much as you would expect. It does the assignment and then, returns the value assigned.

What's this about a "crooked mitre"? I'm good at woodwork!

Comment on Re: Re^3: [substr] anomaly or mine? Download Code

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(tye)Re2: [substr] anomaly or mine? by tye (Sage) on Aug 20, 2002 at 00:53 UTC
Well, `@a[1..3]= "x"` is the same as `@a[1..3]= ( "x", undef, undef )`, and so this seems reasonable to me. [ Note that scalar context changes things since list assignment is documented to return the number of items in the right-hand-side list when evaluated in a scalar context so `1 == scalar( @a[1..3]= "x" )`. ] If there were a way to assign to some kind of variable-length array slice, then we could make a more appropriate comparison between it and the substr "bug" case. - tye (but my friends call me "Tye")	[reply] [d/l] [select]
Re: (tye)Re2: [substr] anomaly or mine? by BrowserUk (Patriarch) on Aug 20, 2002 at 01:09 UTC
Agreed tye, my bad. If you take a look at my updated version, once I remembered the syntax for slices (not so very hard) it actually made the point I set out to make in the first place. That yo can use a slice as an rvalue in a list context and get the result that you would expect! I spent 2 hours verifying the original bug and chose to post rather than mention it in the CB cos I often get extreme lag as you saw earlier. I end up trying to answer the question before the last question asked etc. Then I had a brainfart ........ What's this about a "crooked mitre"? I'm good at woodwork!	[reply]