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52 lines
1.5 KiB
Go
52 lines
1.5 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 array
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import (
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E "github.com/IBM/fp-go/v2/eq"
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)
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func equals[T any](left []T, right []T, eq func(T, T) bool) bool {
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if len(left) != len(right) {
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return false
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}
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for i, v1 := range left {
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v2 := right[i]
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if !eq(v1, v2) {
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return false
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}
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}
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return true
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}
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// Eq creates an equality checker for arrays given an equality checker for elements.
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// Two arrays are considered equal if they have the same length and all corresponding
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// elements are equal according to the provided Eq instance.
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//
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// Example:
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//
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// import "github.com/IBM/fp-go/v2/eq"
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//
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// intArrayEq := array.Eq(eq.FromStrictEquals[int]())
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// result := intArrayEq.Equals([]int{1, 2, 3}, []int{1, 2, 3}) // true
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// result2 := intArrayEq.Equals([]int{1, 2, 3}, []int{1, 2, 4}) // false
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func Eq[T any](e E.Eq[T]) E.Eq[[]T] {
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eq := e.Equals
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return E.FromEquals(func(left, right []T) bool {
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return equals(left, right, eq)
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})
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}
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