File for arguments. 💎

Author: csalmeida

custom-methods/arguments.rb

@@ -0,0 +1,45 @@
+#!usr/bin/env ruby
+
+# Defines a methods with multiple arguments.
+def volume(x, y, z)
+  x * y * z
+end
+
+puts volume(2,3,4)
+puts volume(5,7,8)
+puts volume(42,86,22)
+
+# The order of arguments passed in matters.
+def introduction(greeting, name)
+  puts "#{greeting}, #{name}."
+end
+
+# Here the name is passed in first, resulting on a different output than expected.
+introduction("Yoda","I am") # "Yoda, I am."
+introduction("I am","Groot") # "I am, Groot."
+
+# Arguments can be optional, any object can be passed as a default value.
+def greet(greeting="Hello", name="World")
+  puts "#{greeting}, #{name}"
+end
+
+# Calls greet with no arguments so default ones are used.
+# As per convention the parentheses are kept.
+greet()
+
+welcome_options = {
+  name: "Geralt",
+  punctuation: "..."
+}
+
+# A hash with optional arguments is passed, allowing more flexibility.
+# Each expected key is checked for a value inside the method.
+def welcome(greeting, options={})
+  name = options[:name] || 'friend'
+  punct = options[:punctuation] || '!'
+  greeting + ' ' + name + punct
+end
+
+# The greeting arg is always passed in but the options hash is optional.
+puts welcome("It's you,", welcome_options);
+puts welcome("Hello");