Cool Ruby Feature: A Hash With a Dynamic Default
Posted: Thu, 3 May 2007 | permalink | No comments
h = Hash.new { |h,k| k*k }
h[1] = 42
puts "1 => #{h[1]}, 2 => #{h[2]}, 3 => #{h[3]}"
Produces:
1 => 42, 2 => 4, 3 => 9
It's weird little things like this that make me really love Ruby.
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