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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package util
// Deduplicate deduplicates entries in the given slice.
func Deduplicate[T comparable](in []T) []T {
var (
inL = len(in)
unique = make(map[T]struct{}, inL)
deduped = make([]T, 0, inL)
)
for _, v := range in {
if _, ok := unique[v]; ok {
// Already have this.
continue
}
unique[v] = struct{}{}
deduped = append(deduped, v)
}
return deduped
}
// DeduplicateFunc deduplicates entries in the given
// slice, using the result of key() to gauge uniqueness.
func DeduplicateFunc[T any, C comparable](in []T, key func(v T) C) []T {
var (
inL = len(in)
unique = make(map[C]struct{}, inL)
deduped = make([]T, 0, inL)
)
for _, v := range in {
k := key(v)
if _, ok := unique[k]; ok {
// Already have this.
continue
}
unique[k] = struct{}{}
deduped = append(deduped, v)
}
return deduped
}
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