Sha256: 1c9aac6988ef107a212081fd20acbe3f9504eb9360302cb293fab2c5faed72e5
Contents?: true
Size: 907 Bytes
Versions: 7
Compression:
Stored size: 907 Bytes
Contents
require 'facets/functor'
module Kernel
# Like #respond_to? but returns the result of the call
# if it does indeed respond.
#
# class RespondExample
# def f; "f"; end
# end
#
# x = RespondExample.new
# x.respond(:f) #=> "f"
# x.respond(:g) #=> nil
#
# or
#
# x.respond.f #=> "f"
# x.respond.g #=> nil
#
# This method was known as #try until Rails defined #try
# to be something more akin to #ergo.
#
# CREDIT: Trans, Chris Wanstrath
def respond(sym=nil, *args, &blk)
if sym
return nil if not respond_to?(sym)
__send__(sym, *args, &blk)
else
## TODO: use after 1.8.6 not supported anymore
##Functor.new do |op, *a, &b|
## respond(op, *a, &b)
##end
Functor.new(&method(:respond).to_proc)
end
end
# DEPRECATED: #respond is enough.
#alias_method :respond_with_value, :respond
end
Version data entries
7 entries across 6 versions & 1 rubygems