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Say when to use set vs HashSet

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twetzel59 2017-12-27 21:05:24 -05:00
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Nim-for-Python-Programmers.md
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@ -188,7 +188,7 @@ echo lc[ y*2 | ( y <- x ), int ]
Python sets are not like [Nim set type](http://nim-lang.org/docs/manual.html#types-set-type). Python sets are not like [Nim set type](http://nim-lang.org/docs/manual.html#types-set-type).
If the values that will go in the set are known beforehand and finite, you can create an Enum for them. If the values that will go in the set are known beforehand and finite, you can create an Enum for them.
Otherwise you can emulate a Python set using a [HashSet](http://nim-lang.org/docs/sets.html). Otherwise you can emulate a Python set using a [HashSet](http://nim-lang.org/docs/sets.html).
The Nim set type is faster and memory-efficient. The Nim set type is faster and memory-efficient. In fact, set is implemented with a bit vector, whereas HashSet is implemented as a dictionary. For simple flag types and small mathematical sets, use set.
### Dictionaries ### Dictionaries