go-nul/README.md

go-nul

Package nul implements a nullable optional-type, for the Go programming language.

In other programming languages, an optional-type might be know as: a option-type, or a maybe-type.

Documention

Online documentation, which includes examples, can be found at: http://godoc.org/sourcecode.social/reiver/go-nul

Examples

Here is an example nullable optional-type that can hold a string:

import "sourcecode.social/reiver/go-nul"

//

var op nul.Optional[string] // the default value is nothing.

// ...

if nul.Nothing[string]() == op {
	fmt.Println("nothing")
}

// ...

op = nul.Null[string]()

// ...

if nul.Null[string]() == op {
	fmt.Println("null")
}

// ...

op = nul.Something("Hello world! 👾")

// ...

switch op {
case op.Nothing[string]():
	//@TODO
case op.Null[string]():
	//@TODO
case op.Something("apple"):
	//@TODO
case op.Something("banana"):
	//@TODO
case op.Something("cherry"):
	//@TODO
default:
	//@TODO
}

// ...

value, found := op.Get()
if found {
	fmt.Println("VALUE:", value)
} else {
	fmt.Println("either nothing or null")
}