mirror of
https://github.com/IBM/fp-go.git
synced 2025-08-10 22:31:32 +02:00
51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
// Copyright (c) 2023 IBM Corp.
|
|
// All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package writer
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
A "github.com/IBM/fp-go/array"
|
|
F "github.com/IBM/fp-go/function"
|
|
M "github.com/IBM/fp-go/monoid"
|
|
T "github.com/IBM/fp-go/tuple"
|
|
)
|
|
|
|
func doubleAndLog(data int) Writer[[]string, int] {
|
|
return func() T.Tuple2[int, []string] {
|
|
result := data * 2
|
|
return T.MakeTuple2(result, A.Of(fmt.Sprintf("Doubled %d -> %d", data, result)))
|
|
}
|
|
}
|
|
|
|
func ExampleWriter_logging() {
|
|
|
|
m := A.Monoid[string]()
|
|
s := M.ToSemigroup(m)
|
|
|
|
res := F.Pipe3(
|
|
10,
|
|
Of[int](m),
|
|
Chain[int, int](s)(doubleAndLog),
|
|
Chain[int, int](s)(doubleAndLog),
|
|
)
|
|
|
|
fmt.Println(res())
|
|
|
|
// Output: Tuple2[int, []string](40, [Doubled 10 -> 20 Doubled 20 -> 40])
|
|
|
|
}
|