opt.Optional[T]

master
Charles Iliya Krempeaux 2022-08-08 10:14:51 -07:00
parent e86446ff5b
commit 9cbd049b34
1 changed files with 37 additions and 0 deletions

View File

@ -9,3 +9,40 @@ In other programming languages, an **optional-type** might be know as: a **optio
Online documentation, which includes examples, can be found at: http://godoc.org/github.com/reiver/go-opt
[![GoDoc](https://godoc.org/github.com/reiver/go-opt?status.svg)](https://godoc.org/github.com/reiver/go-opt)
## Examples
Here is an example **optional-type** that can hold a string:
```go
var op opt.Optional[string] // the default value is nothing.
// ...
if opt.Nothing[string]() == op {
fmt.Println("nothing")
}
// ...
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")
}
```