Ruby Method Arguments

argument_passing_to_methods.rb

# with this syntax, the order of parameters does not matter
# have to use same name for parameters when passing arguments

#! required and optional arguments are ordered
#! order of passing parameters
  #! required => optional => variable => keyword

#! keyword arguments => for more clarity, and removing the need for arguments to be ordered
def method_1(m1:, m2:, m3:)
  p m1, m2, m3
end
# method_1(m1:2,m9:3,m2:4)

  #! keyword arguments can also be optional with a default value
  def method_1(m1:2, m2:, m3:3)
    p m1, m2, m3
  end
  #method_1(m1:20,m3:30,m2:40)  # the value for m1 and m2 passed in as argument will be overwritten

#! optional arguments
def testing(a, b=1)
  p a,b
end
# testing (23)

#! variable arguments => to capture many arguments as an ARRAY (SPLAT OPERATOR)
def print_all(*args)
  p args
end
#print_all(2,3,4,5,6, alpha:"23")

#! variable keyword arguments => to capture many arguments as a HASH (DOUBLE SPLAT OPERATOR)
def print_all(**args)
  p args
end

#! *x and **x are both variable arguments
  #// if keyword argument is not passed in before variable keyword arguments,
    #//  the keyword argument will be captured in the variable keyword argument because of the key:value notation

def testing(a, b = 1, *c, d:1, **x)
  p a
  p b 
  p c
  p d
  p x
end
testing('a', 10, 'c', de: 2, alpha:"num", "radon":"noble gas")