Sha256: 6f9286c9b8585f875d2ad0c40a9dc22a714697fb6f4ba01d25bc4b105a73c655
Contents?: true
Size: 869 Bytes
Versions: 7
Compression:
Stored size: 869 Bytes
Contents
# = Chain
#
# Expiremental library for safe method chaining.
#
# person = "John Doe"
# def person.address = "123 West St."
# person.address.street #=> Error
#
# To avoid the error use #chain:
#
# person.chain.address.street.end #=> nil
#
# Or
#
# ~ person.chain.address.street #=> nil
#
class Chain
private *instance_methods.select{|m| m !~ /^__/ }
def initialize(value)
@value = value
end
def method_missing(s,*a, &b)
if @value.respond_to?(s)
@value = @value.__send__(s,*a,&b)
else
@missing = true
end
#begin
# @value = @value.__send__(s,*a,&b)
#rescue NoMethodError
# @missing = true
#end
self
end
#def value?
# @value
#end
def end
@missing ? nil : @value
end
def ~@
@missing ? nil : @value
end
end
module Kernel
def chain
Chain.new(self)
end
end
Version data entries
7 entries across 7 versions & 2 rubygems