When does it make sense to use a map?

Posted by kiwicptn on Stack Overflow See other posts from Stack Overflow or by kiwicptn
Published on 2010-03-11T20:06:28Z Indexed on 2010/03/14 18:45 UTC
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Filed under:

map

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mapping

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language-agnostic

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data-structures

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dictionary

I am trying to round up cases when it makes sense to use a map (set of key-value entries). So far I have two categories (see below). Assuming more exist, what are they?

Please limit each answer to one unique category and put up an example.

Property values (like a bean)

age -> 30
sex -> male
loc -> calgary

Presence, with O(1) performance

peter -> 1
john  -> 1
paul  -> 1

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