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46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
// Copyright (c) 2023 IBM Corp.
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// All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package writer
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import (
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"fmt"
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A "github.com/IBM/fp-go/array"
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F "github.com/IBM/fp-go/function"
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P "github.com/IBM/fp-go/pair"
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)
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func doubleAndLog(data int) Writer[[]string, int] {
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return func() P.Pair[int, []string] {
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result := data * 2
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return P.MakePair(result, A.Of(fmt.Sprintf("Doubled %d -> %d", data, result)))
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}
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}
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func ExampleWriter_logging() {
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res := F.Pipe3(
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Of[int](monoid, 10),
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Chain(sg, doubleAndLog),
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Chain(sg, doubleAndLog),
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Execute[[]string, int],
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)
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fmt.Println(res)
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// Output: [Doubled 10 -> 20 Doubled 20 -> 40]
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}
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