Performance improvements #7
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Improves the performance of the isProfane method by returning true after any bad word is found, rather than matching all bad words in the string.
Improves performance of clean by replacing use of:
`e.replaceAll(RegExp('.'), '*')`
with:
`''.padLeft(e.length, '*')`
I benchmarked a few different methods before settling on this implementation:
1. `padLeft`, i.e. `''.padLeft(e.length, '*')`
2. Dart's built-in string multiplication, i.e. `'*' * e.length`
3. The existing implementation
For the benchmark I replaced a string with 10,000,000 characters. The results were conclusive:
```
$ dart bad_words/benchmark/filter_benchmark.dart
PadLeft(RunTime): 131323.25 us.
StrMultiply(RunTime): 306138.85714285716 us.
RegExp(RunTime): 7393837.0 us.
```
The `padLeft` method performed around 56x faster than the previous implementation.
Improve performance by using a set literal rather than list literal for the bad words. Making this change also required removal of some duplicate values.
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@benbarbersmith sorry for the MIA. I really like these improvements, and I'm inclined to absolutely merge. |
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Several of the words in the list were repeated. (Once I converted the list to a set literal, |
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A bundle of a few minor performance improvements:
isProfanemethod by returning true after any bad word is found, rather than matching all bad words in the string.cleanby 56x by replacing use ofe.replaceAll(RegExp('.'), '*')with''.padLeft(e.length, '*').See commit messages for more detail.