Difference between revisions of "Optimizing code"
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(Created page with 'This is a page on code optimization--practices that encourage efficient code. == Avoid shift == Shifting to get arguments from <code>@_</code> is slower than using <code>$_[0]<...') |
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== Avoid shift == | == Avoid shift == | ||
| − | + | The <code>shift()</code>> function, used to take the first argument from the <code>@_</code> list, is slow. Instead: | |
| + | |||
| + | * For short functions (1-5 lines), use <code>$_[0]</code> for the first argument, <code>$_[1] for the second, etc. | ||
| + | * For longer functions, use the following construct to assign the values to named scalars: | ||
| + | |||
| + | <source lang="perl">my ( $foo, $bar ) = @_;</source> | ||
| + | |||
| + | ([http://bugs.dwscoalition.org/show_bug.cgi?id=1367 source]) | ||
[[Category: Development]] | [[Category: Development]] | ||
Revision as of 17:51, 6 July 2009
This is a page on code optimization--practices that encourage efficient code.
Avoid shift
The shift()> function, used to take the first argument from the @_ list, is slow. Instead:
- For short functions (1-5 lines), use
$_[0]for the first argument,$_[1] for the second, etc. - For longer functions, use the following construct to assign the values to named scalars:
my ( $foo, $bar ) = @_;
(source)
