Methods

Methods

Ruby methods are powerful and easy-to-use. This is their syntax:

def method_name
end

Here's a basic method with one parameter:

def double(x)
  x * 2
end

Methods (and blocks) implicitly return the value of the last statement

double(2) #=> 4

You can also use an explicit return:

def square(x)
   return x * x
end    

Parentheses are optional where the result is unambiguous

double 3 #=> 6
double double 3 #=> 12

Multiple Parameters are separated with commas:

def sum(x,y)
  x + y
end

...and commas are used again when calling the method:

sum 3, 4 #=> 7