Our little programming contest was fun and we can learn something about best practices in javascript algorithm performance. I have prepared some micro benchmarks for common code sniplets to find the best variant. After the section with the micro benchmarks you can find the best-performed solution by running the JSLitmus test and browse through the javascript code. And yes - our co-author Matthias had the best solution with factor 20-35 faster than the clean code variant. No solution is close with the performance to Matthias' solution!
Knowing some javascript performance hints are importend. The different javascript interpreter with Just-In-Time-Optimizer can offer some surprise in the following basic code examples.
- Adding Numbers to an Array
- Using code in loop-header or Body
- Round down a Number
- Using linear Array or Object (=hashmap) for caching Numbers
- Find a substring in a String
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