Ruby raise argumenterror

# raise ArgumentError, 'Put error message here' unless some_condition
# example from source link

def inverse(x)  
  raise ArgumentError, 'Argument is not numeric' unless x.is_a? Numeric  
  1.0 / x  
end  

puts inverse(2) # 0.5
puts inverse('not a number') # ArgumentError

Source: rubylearning.com

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