From: ts <decoux@...>
Date: 2002-11-27T20:00:07+09:00
Subject: Re: Sort by hash element

>>>>> "T" == Tim Bates <tim@bates.id.au> writes:

T> Is there an easy, Ruby-idiomatic way to sort this array by the 'score' 
T> elements of each hash? eg so I get

 Well, you can give it a block

pigeon% ri Array#sort
------------------------------------------------------------- Array#sort
     arr.sort -> anArray 
arr.sort {| a,b | block }  -> anArray 
------------------------------------------------------------------------
     Returns a new array created by sorting arr. Comparisons for the
     sort will be done using the <=> operator or using an optional code
     block. The block implements a comparison between a and b, returning
     -1, 0, or +1.
        a = [ "d", "a", "e", "c", "b" ]
        a.sort                    #=> ["a", "b", "c", "d", "e"]
        a.sort {|x,y| y <=> x }   #=> ["e", "d", "c", "b", "a"]

pigeon% 


pigeon% ruby
a = [{'name'=>'Anna', 'score'=>11}, {'name'=>'Bryce', 'score'=>7}, 
{'name'=>'Chris', 'score'=>9}]
b = a.sort {|k,l| k['score'] <=> l['score']}
p b
^D
[{"score"=>7, "name"=>"Bryce"}, {"score"=>9, "name"=>"Chris"},
{"score"=>11, "name"=>"Anna"}] 
pigeon% 


Guy Decoux