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Multiple required parameters

suggest change 
def greet(greeting, name)
    puts "#{greeting} #{name}"
end

greet('Hi', 'Sophie')    # Hi Sophie
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Methods:
* Methods
* Defining a method
* Yielding to blocks
* Default parameters
* Optional parameters splat operator
* Single required parameter
* Required default optional parameter mix
* Use a function as a block
* Tuple Arguments
* Method Definitions are Expressions
* Capturing undeclared keyword arguments double splat
* Multiple required parameters
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