October 2014
Intermediate to advanced
280 pages
7h 20m
English
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How to Choose Between Maps, HashDicts, and Keywords
Ask yourself these questions (in this order):
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Will I want more than one entry with the same key?
If so, you’ll have to use the Keyword module.
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Do I need to guarantee the elements are ordered?
If so, again, use the Keyword module.
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Do I want to pattern-match against the contents (for example, matching a dictionary that has a key of :name somewhere in it)?
If so, use a map.
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Will I be storing more than a few hundred entries in it?
If so, use a HashDict. With R17 of the BEAM virtual machine (which runs Erlang), maps are slow, particularly when adding new items.[13] This should improve in R18.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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