zetixar / triangle-classification-cb-000

Triangle

Objectives

1. Define a custom error and use it.

Instructions

• Write a Triangle class that accepts three arguments on initialization. Each argument is a length of one of the three sides of the triangle.

• Give your Triangles an instance method, kind that returns, as a symbol, its type. The valid types are:

1. :equilateral

2. :isosceles

3. :scalene

• The kind method should raise a custom error, TriangleError if the triangle is invalid. Check out the hint below to understand what makes a triangle invalid. Write a custom error class, TriangleError and inherit it from StandardError. This custom error class should be defined in the same file at the Triangle class, but *outside of the class definition of Triangle. Like this:

# lib/triangle.rb

class Triangle
  # triangle code
end

class TriangleError < StandardError
 # triangle error code
end

Hint

The sum of the lengths of any two sides of a triangle always exceeds the length of the third side. This is a principle known as the triangle inequality.

Further, each side must be larger than 0.

Resources

• Quick Exceptions
• Exception Handling
• Basic Mathematics - Types of Triangles

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