method

sort

v1_8_6_287 - Show latest stable - 1 note - Class: Hash

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What's this?

sort() public

Converts hsh to a nested array of [ key, value ] arrays and sorts it, using Array#sort.

   h = { "a" => 20, "b" => 30, "c" => 10  }
   h.sort                       #=> [["a", 20], ["b", 30], ["c", 10]]
   h.sort {|a,b| a[1]<=>b[1]}   #=> [["c", 10], ["a", 20], ["b", 30]]

Show source

/*
 *  call-seq:
 *     hsh.sort                    => array 
 *     hsh.sort {| a, b | block }  => array 
 * 
 *  Converts <i>hsh</i> to a nested array of <code>[</code> <i>key,
 *  value</i> <code>]</code> arrays and sorts it, using
 *  <code>Array#sort</code>.
 *     
 *     h = { "a" => 20, "b" => 30, "c" => 10  }
 *     h.sort                       #=> [["a", 20], ["b", 30], ["c", 10]]
 *     h.sort {|a,b| a[1]<=>b[1]}   #=> [["c", 10], ["a", 20], ["b", 30]]
 *     
 */

static VALUE
rb_hash_sort(hash)
    VALUE hash;
{
    VALUE entries = rb_hash_to_a(hash);
    rb_ary_sort_bang(entries);
    return entries;
}

March 31, 2009

3 thanks

Sorting Hashes with Symbol Keys

To sort a hash with symbol keys, use Enumerable#sort_by:

h = { :a => 20, :b => 30, :c => 10  }
h.sort                       # => NoMethodError: undefined method `<=>' for :a:Symbol
h.sort_by { |k,v| k.to_s }   # => [[:a, 20], [:b, 30], [:c, 10]]

sort

Related methods

Sorting Hashes with Symbol Keys