Ruby arguments

ruby_args.rb

# Function with 2 arguments and no default values
[1] pry(main)> def test(one, two)
[1] pry(main)*   puts one
[1] pry(main)*   puts two
[1] pry(main)* end

# Function with 2 arguments has a default value on 2
[2] pry(main)> def test2(one, two="world!")
[2] pry(main)*   puts one
[2] pry(main)*   puts two
[2] pry(main)* end

# Function with 1 argument (uses a hash and defaults in the body)
[3] pry(main)> def test3(hsh)
[3] pry(main)*   puts hsh[:one]
[3] pry(main)*   puts (hsh[:two] || "world!")
[3] pry(main)* end

# Works with 2 args
[4] pry(main)> test "hello", "world!"
hello
world!
=> nil

# Errors with 1 arg
[5] pry(main)> test "hello"
ArgumentError: wrong number of arguments (1 for 2)
from (pry):1:in `test'

# Works with 1 arg
[6] pry(main)> test2 "hello"
hello
world!
=> nil

# ...or 2 args
[7] pry(main)> test2 "hello", "world!"
hello
world!
=> nil

# takes a hash (give it as many "args" as you want but they're name sensitive)
[8] pry(main)> test3 :one => "hello", :two => "there"
hello
there
=> nil
[9] pry(main)> test3 :one => "hello"
hello
world!
=> nil
[10] pry(main)> test3 :one => "hello", :three => "there", :four => "you"
hello
world!
=> nil