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Contents
#--
# Credit goes to Florian Gross (flgr) for orignal version.
# Credit goes to Nobuhiro Imai for latest version.
#++
class Symbol
# Turn a symbol into a proc calling the method to
# which it refers.
#
# up = :upcase.to_proc
# up.call("hello") #=> HELLO
#
# More useful is the fact that this allows <tt>&</tt>
# to be used to coerce Symbol into Proc.
#
# %w{foo bar qux}.map(&:upcase) #=> ["FOO","BAR","QUX"]
# [1, 2, 3].inject(&:+) #=> 6
#
def to_proc
Proc.new{|*args| args.shift.__send__(self, *args)}
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCSymbol < Test::Unit::TestCase
def test_001
assert_instance_of(Proc, up = :upcase.to_proc )
assert_equal( "HELLO", up.call("hello") )
end
def test_002
q = [[1,2,3], [4,5,6], [7,8,9]].map(&:reverse)
a = [[3, 2, 1], [6, 5, 4], [9, 8, 7]]
assert_equal( a, q )
end
end
=end
Version data entries
14 entries across 14 versions & 1 rubygems