Go uses a program called compiler, which reads Go source code and translates it into machine code.

In order for Go code to produce an executable, there has to be some code ina special package called main.

Since you can’t have more than one package in the same folder (except for test packages), you need to put main package in a subfolder of the project. Because the main package produces a command (the executable), it’s conventional to name this folder cmd.

The main package also needs to contain the main function, which is where the program will start.

References

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