September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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Intentional Programming
Intentional programming is a name given to a style of
programming where we can easily see what was intended by the
programmer. The intention of the programmer should be obvious
from the names of the functions involved and not be inferred by
analyzing the structure of the code. This is best explained by
an example. In the early days of Erlang, the library module
dict exported a function lookup/2 that had
the following interface:
| | lookup(Key, Dict) -> {ok, Value} | not_found |
Given this definition, lookup could be used in three different
contexts.
-
For data retrieval, we could write the following:
{ok, Value} = lookup(Key, Dict)Here
lookupis used to extract an item with a known key from the dictionary. If the key ...
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