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(elisp)Hash Table Type

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Hash Table Type
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   A hash table is a very fast kind of lookup table, somewhat like an
alist in that it maps keys to corresponding values, but much faster.
Hash tables are a new feature in Emacs 21; they have no read syntax, and
print using hash notation.  Note: Hash Tables.

     (make-hash-table)
          => #<hash-table 'eql nil 0/65 0x83af980>