TECH603 Day 3 - Working with functions

functions.rb

a, b = "a", "b"
c = "c"
d = "d"
e = "e"
f = "f"

# define it - ugly style
def function0(arg0, arg1, arg2, arg3, arg4, arg5)
  puts "you passed in #{arg0}, #{arg1}, #{arg2}, #{arg3}, #{arg4}, and #{arg5}"
end

# call it
function0(a, b, c, d, e, f)

# let's use an array instead of an ugly list of args
def function1(array)
  puts "you passed in #{array}"
end

function1([a, b, c, d, e, f])

# let's do a special thing - splatting! yay 
def function2(*args)
  puts args.class
  puts "you passed in #{args}"
end

function2(a, b, c, d, e, f)
function2(a)

# look ma, no parens!
def increment number, step = 1
  puts number + step
end

increment 1, 1
increment 5, 5
increment 2

def increment(number, step = 1)
  puts number + step
end

increment(1, 1)
increment(5, 5)
increment(2)

# keyword
def keyword_args(arg0:, arg1:, arg2:, arg3:, arg4:, arg5:)
  puts "you passed in #{arg0}, #{arg1}, #{arg2}, #{arg3}, #{arg4}, and #{arg5}"
end

keyword_args(arg1: b, arg2: c, arg3: d, arg4: e, arg5: f, arg0: a)

# using a hash <- old school
def address_with_hash(address_hash)
  puts "#{address_hash["name"]} #{address_hash["street"]}"
end

# with keyword args... and a double splat!
def address(name:, street:, city:, state: "NV", zip:, **kwargs)
  puts "#{name} #{street} #{state}"
  puts "kwargs: #{kwargs}"
end

address("Don Morrison", "123 Street", "Springfield", "NV", "12345")

def address(**kwargs)
  puts "kwargs: #{kwargs}"
end

address(
  foo: "bar",
  zip: "12345",
  name: "Don Morrison",
  street: "123 Sesame Street",
  city: "Springfield",
  state: "NV",
  country: "USA"
)

# increment using kwargs
def inc(number, by: 1)
  puts number + by
end

inc(1, by: 1)
inc(5, by: 5)
inc(2)

def join_words(*words)
  first = words[0...-1].join(", ")
  last = words[-1]
  
  puts "you passed in #{first}, and #{last}"
end

join_words("one", "two")
join_words("one", "two", "three", "four")