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contramap.go
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contramap.go
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// 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 predicate
import (
F "github.com/IBM/fp-go/function"
)
// ContraMap creates a predicate from an existing predicate given a mapping function
func ContraMap[A, B any](f func(B) A) func(func(A) bool) func(B) bool {
return func(pred func(A) bool) func(B) bool {
return F.Flow2(
f,
pred,
)
}
}