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 AN!Wiki :: Hash

A hash table, also known as a dictionary, is a programmatic way of storing elements in a way that allows their retrieval by using a named key. This allows a program to not worry about where in the hash an element is at any given time as it's position is irrelevant to it's retrieval.

  • Hash tables are generally slower than arrays.

Hash tables are often expressed in the following format:

  • Creating a hash table with four key/value pairs.
       some_key    => "first_element",
       another_key => "foobar",
       this_key    => 12,
       that_key    => "30.5"
  • Retrieving one of the elements by using the associated key name.
print hash{that_key};   # Would print "30.5".

In Perl, hashes are prefixed with the '%' symbol.


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