One can do this:
s="puts"
send(s,"Hello World!")
# => Hello World!
How can one check if s is a method? If it was:
s="nomethod"
send(s,arg) will fail.
This would be cool:
ismethod? s
P.S. I am porting something from PHP, which relies on:
if (function_exists($s))
...
If only Ruby had something so simple.
Try this:
respond_to?(method_name)
It should return true if the current object (self) responds to a method by that name. You can use respond_to? on any Ruby object.
respond_to?(s) results in false, as does (obviously) resond_to?("puts"). What's odd is that respond_to?(puts) results in TypeError: nil is not a symbol nor a string (respond_to?(gak) results in NameError: undefined local variable or method 'gak' which is expected)puts returns nil.)
respond_to?('puts') is actually retuning nil for me in IRB, and I don't know why. But Kernel.respond_to?('puts') returns true.Kernel module. Thank you.