Sha256: 1df973d2202a48e7bbe7036087c926c19c2774cc71b9ab478ef303e1e3661597
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Size: 962 Bytes
Versions: 7
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Stored size: 962 Bytes
Contents
module Enumerable
# Like <tt>#map</tt>/<tt>#collect</tt>, but generates a Hash. The block
# is expected to return two values: the key and the value for the new hash.
#
# numbers = (1..3)
# squares = numbers.mash { |n| [n, n*n] } # { 1=>1, 2=>4, 3=>9 }
# sq_roots = numbers.mash { |n| [n*n, n] } # { 1=>1, 4=>2, 9=>3 }
#
# CREDIT: Trans
# CREDIT: Andrew Dudzik (adudzik)
#
# NOTE: Would #correlate would be better?
def mash(&yld)
if yld
inject({}) do |h, *kv| # Used to be inject({}) do |h,kv|
r = *yld[*kv] # The *-op works differnt from to_a on single element hash!!!
nk, nv = *r # Used to be nk, nv = *yld[*kv].to_a.flatten
h[nk] = nv
h
end
else
Enumerator.new(self,:graph) # Used to be Hash[*self.to_a] or Hash[*self.to_a.flatten]
end
end
# Alias for #mash. This is the original name for this method.
alias_method :graph, :mash
end
Version data entries
7 entries across 7 versions & 2 rubygems