Marc Concepcion's Geometry Demo codes to demonstrate Test-Driven Development in Go Language

This is a Go implementation of the GeometryDemoPython TDD that I had made.

This is a simple Go project that contains types and functions that represent the geometric measurement properties of some well-known two-dimensional and three-dimensional shapes.

This demo generically classifies the shapes into:

Two-Dimensional Shapes

For each of the Two-Dimensional Shape, its area and perimeter properties are defined.

Here are the two-dimensional shapes described by the project:

1. Circle *
2. Rectangle
3. Square
4. Triangle

*Please take note that I treat the circumference of a circle as its perimeter based from this statement from Wikipedia: "The perimeter of a circle or ellipse is called its circumference."

Source: https://en.wikipedia.org/wiki/Perimeter

Three-Dimensional Shapes.

For each of the Three-Dimensional Shape, its surface area and volume properties are defined.

Here are the three-dimensional shapes described by the project:

1. Prism
2. Cube
3. Rectangular Prism
4. Triangular Prism
5. Cylinder **
6. Sphere

** Please take note that I treat Cylinder as a Prism based from this statement from Wikipedia: "A solid circular cylinder can be seen as the limiting case of an n-gonal prism where n approaches infinity." Source: https://en.wikipedia.org/wiki/Cylinder#Prisms

Objective

The objective of this project is to perform test-driven development to define each shape into production.

About Go Lang

Unlike the similar TDD demo projects I made on Python, PHP and Raku Perl, creating this TDD demo project with Go language requires an almost totally new perspective in coding. Go language does not have well-known classes, exceptions, inheritance and elementary object-oriented programming that I am very very much accustomed to.

Inspite of the 'culture shock', I successfully managed to practice the same spirit of TDD and SOLID-style programming using Go language. I can still use the superior power of the simple interface. I can still implement an IS-A relationship inspite of not having classes and inheritance (through composition which actually enforces a HAS-A relationship and therefore is a workaround).

Go lang's dual function return (the other for error return) is actually a better error handling technique than using exception which is actually a goto in disguise.

Through this Go lang's TDD demo, I realize that Go lang actually simplifies programming. It challenges and shatters our well-known and well-upheld ideology on good coding making us realize that there could be a significantly different way of coding better.

By setting aside C++ and the popular languages right after (C#, Java, PHP, Python, Perl etc.) and going back the C language to start a new progressive path on good programming,

Go actually opens my eyes and expands my mind on exploring a different paradigm of coding better without sacrificing basic principles of good programming.

There is a big promise on Go lang. As a programming language made by Google, I expect lots of support and an instant wealth of frameworks and modules that would quickly promote the use of this young language.

Finally, my advice to you all using some Filipino Tagalog words:

GO lang ng GO!