Sha256: 496e0c0f2667e5aae2ea4878a9d09cf1d7f113ed8450ad2d19e3208f26118e5e
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Versions: 7
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Stored size: 1.11 KB
Contents
class Hash
# Returns a new hash created by traversing the hash and its subhashes,
# executing the given block on the key and value. The block should
# return a 2-element array of the form +[key, value]+.
#
# h = { "A"=>"A", "B"=>"B" }
# g = h.traverse { |k,v| [k.downcase, v] }
# g #=> { "a"=>"A", "b"=>"B" }
#
# TODO: Contrast these to recursibely --we may not need both.
#
# TODO: Testing value to see if it is a Hash also catches subclasses of Hash.
# This is probably not the right thing to do and should catch Hashes only (?)
#
# CREDIT: Trans
def traverse(&b)
inject({}) do |h,(k,v)|
v = ( Hash === v ? v.traverse(&b) : v )
nk, nv = b[k,v]
h[nk] = nv #( Hash === v ? v.traverse(base,&b) : nv )
h
end
end
# In place version of traverse, which traverses the hash and its
# subhashes, executing the given block on the key and value.
#
# h = { "A"=>"A", "B"=>"B" }
# h.traverse! { |k,v| [k.downcase, v] }
# h #=> { "a"=>"A", "b"=>"B" }
#
# CREDIT: Trans
def traverse!(&b)
self.replace( self.traverse(&b) )
end
end
Version data entries
7 entries across 7 versions & 2 rubygems