Optimize Perl
By Martin C. Brown2005-04-11
Use References
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If you work with large arrays or hashes and use them as arguments to functions, use a reference instead of the variable directly. By using a reference, you tell the function to point to the information. Without a reference, you copy the entire array or hash onto the function call stack, and then copy it again in the function. References also save memory (which reduces footprint and management overheads) and simplify your programming.
Tutorial Pages:
» Squeeze the Most From Your Code
» Sloppy Programming, Sloppy Performance
» Approaching Optimization
» Use References
» String Handling
» Loops
» Sorts
» Using Short Circuit Logic
» Use AutoLoader
» Using Bytecode and the Compiler Back Ends
» Other Tools
» Putting it All Together
» Resources
First published by IBM DeveloperWorks
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