Difference between revisions of "Optimizing code"
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== Avoid shift == | == Avoid shift == | ||
| − | The <code>shift()</code> function, used to | + | The <code>shift()</code> function, used to get the first variable from arrays like the <code>@_</code> argument list for functions, is slow. Use these alternatives instead: |
* For short functions (1-5 lines), use <code>$_[0]</code> for the first argument, <code>$_[1]</code> for the second, etc. | * For short functions (1-5 lines), use <code>$_[0]</code> for the first argument, <code>$_[1]</code> for the second, etc. | ||
Revision as of 17:54, 6 July 2009
This is a page on code optimization--practices that encourage efficient code.
Avoid shift
The shift() function, used to get the first variable from arrays like the @_ argument list for functions, is slow. Use these alternatives 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)
