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Single required parameter

suggest change 
def say_hello_to(name)
    puts "Hello #{name}"
end

say_hello_to('Charles')    # Hello Charles
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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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