Package opt implements an 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.
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Charles Iliya Krempeaux 4cd974c11f opt.Then() — I would prefer that map be a method, but the current implementation of Go generatics does not seem to support that 2022-08-14 00:03:55 -07:00
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then.go opt.Then() — I would prefer that map be a method, but the current implementation of Go generatics does not seem to support that 2022-08-14 00:03:55 -07:00
then_test.go opt.Then() — I would prefer that map be a method, but the current implementation of Go generatics does not seem to support that 2022-08-14 00:03:55 -07:00

README.md

go-opt

Package opt implements an 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/github.com/reiver/go-opt

GoDoc

Examples

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

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

// ...

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

// ...

op = opt.Something("Hello world! 👾")

// ...

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

// ...

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