A Rust-inspired implementation of Option and Result types using generic structs.
Requires: Go >= 1.18 (generics added).
value, err := MyFallibleFunction()
res := Result(value, err)
if res.IsOk(){
...
}value, err := MyFallibleFunction()
res := Result(value, err)
value = res.UnwrapOr(value2)Option constructor accepts pointers:
maybe := Option(ReturnsPtr())
if maybe.IsSome(){
...
}maybe := Option(ReturnsPtr())
value := maybe.UnwrapOr(myDefaultValue)Use OptionType or ResultType for type defintions such as function returns:
func MyOptionalInt() OptionType[int]{
...
}func MyFallibleInt() ResultType[int]{
...
}Supports Scan interface from database/sql and implements a ToDB helper method:
db := Result(sql.Open("sqlite3", ":memory:")).Unwrap()
defer db.Close()
Result(db.Exec("CREATE TABLE test (id INTEGER PRIMARY KEY, value INTEGER)")).Unwrap()
Result(db.Exec("INSERT INTO test (value) VALUES (1)")).Unwrap()
var i *int64 // sql driver requires int64
opt := Option(i)
_ = db.QueryRow("SELECT value FROM test WHERE id = 1").Scan(&opt)
fmt.Println(opt.Some()) // prints 1db := Result(sql.Open("sqlite3", ":memory:")).Unwrap()
defer db.Close()
Result(db.Exec("CREATE TABLE test (id INTEGER PRIMARY KEY, value INTEGER)")).Unwrap()
var i *int64 // sql driver requires int64
opt := Option(i)
insert := Result(db.Exec(
"INSERT INTO test (value) VALUES (?)",
Result(opt.ToDB()).Unwrap(),
))See tests for a few more examples.