fp-go/samples/presentation/examples/example_hof_test.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 examples

import "fmt"

func captureValue[T any](captured T) func() string {
	return func() string {
		return fmt.Sprintf("Value: %v", captured)
	}
}

func Example_closure() {

	hof := captureValue("Carsten") // func() string

	fmt.Println(hof())

	// Output:
	// Value: Carsten
}