I want to achieve something like below. Defining method names based on array arguments and Call them.
arr = ['alpha', 'beta', 'gamma']
arr.each { |role|
# If the method already exists don't define new
if ! method_exist? "init_#{role}"
define "init_#{role}"
p "I am method init_#{role}"
end
}
init_beta
init_gamma
Edit: If such a method already exists, don't define a new method.
Do as below :
arr = ['alpha', 'beta', 'gamma']
arr.each do |role|
# this code is defining all the methods at the top level. Thus call to
# `method_defined?` will check if any method named as the string argument
# is already defined in the top level already. If not, then define the method.
unless self.class.private_method_defined?( "init_#{role}" )
# this will define methods, if not exist as an instance methods on
# the top level.
self.class.send(:define_method, "init_#{role}" ) do
p "I am method init_#{role}"
end
end
end
init_beta # => "I am method init_beta"
init_gamma # => "I am method init_gamma"
Look at the documentation of private_method_defined and define_method.
Note : I have used private_method_defined?, as on top level, all instance method you will be defining ( using def or define_method in the default accessibility level ), become as private instance methods of Object. Now as per your need you can also check protected_method_defined? and public_method_defined? accordingly.
