September 2013
Intermediate to advanced
548 pages
12h 25m
English
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Maps: Associative Key-Value Stores
Maps were made available from version R17 of Erlang.
Maps have the following properties:
-
The syntax of maps is similar to that of records, except the record name is omitted and the key-value separator is either
=>or:=. -
Maps are associative collections of key-value pairs.
-
The keys in a map can be any fully ground Erlang term (fully grounded means that there are no unbound variables in the term).
-
The elements in a map are ordered by the keys.
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Updating a map where the keys are not changed is a space-efficient operation.
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Looking up the value of a key in a map is an efficient operation.
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Maps have a well-defined order.
We’ll look at maps in more detail in the following sections.
The Semantics of Maps
Map literals ...
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