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GNU Emacs Lisp Reference Manual

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2.3.12 Hash Table Type

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. See section 7. Hash Tables.

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


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