Package nul implements a nullable optional-type, for the Go programming language.
In other programming languages, an optional-type might be known as: a option-type, or a maybe-type.
Online documentation, which includes examples, can be found at: http://godoc.org/sourcecode.social/reiver/go-nul
Here is an example nullable optional-type that can hold a string:
import "sourcecode.social/reiver/go-nul"
//
var op nul.Nullable[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")
}To import package nul use import code like the follownig:
import "sourcecode.social/reiver/go-nul"
To install package nul do the following:
GOPROXY=direct go get https://sourcecode.social/reiver/go-nul
Package nul was written by Charles Iliya Krempeaux
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