Re^2: printing every 2nd entry in a list backwards

tobyink: is_fastest, cool! You always have the newest toys! Do you have an opinion about why grep with state is so much slower than grep with my?

The way forward always starts with a minimal test.

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Re^3: printing every 2nd entry in a list backwards by tobyink (Canon) on May 19, 2017 at 16:56 UTC
Well, it necessitates using a block, and the block form of grep is a little slower than the expression form. `grep { BLOCK } @list; # slow grep EXPRESSION, @list; # fast` [download] But it's not just that. Even if you make them both use the block form of grep, state comes out behind my. I guess they've just put a lot of work into optimizing how fast normal lexical variables work, and less work into state variables.	[reply] [d/l]

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Re^3: printing every 2nd entry in a list backwards
by tobyink (Canon) on May 19, 2017 at 16:56 UTC

Well, it necessitates using a block, and the block form of grep is a little slower than the expression form.

grep { BLOCK } @list;   # slow
grep EXPRESSION, @list; # fast
[download]

But it's not just that. Even if you make them both use the block form of grep, state comes out behind my. I guess they've just put a lot of work into optimizing how fast normal lexical variables work, and less work into state variables.

[reply]
[d/l]