/*
 *     Copyright 2023 The Dragonfly Authors
 *
 * 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 slice

func KeyBy[K comparable, V any](collection []V, iteratee func(item V) K) map[K]V {
	result := make(map[K]V, len(collection))

	for i := range collection {
		k := iteratee(collection[i])
		result[k] = collection[i]
	}

	return result
}

func Values[K comparable, V any](in ...map[K]V) []V {
	size := 0
	for i := range in {
		size += len(in[i])
	}
	result := make([]V, 0, size)

	for i := range in {
		for k := range in[i] {
			result = append(result, in[i][k])
		}
	}

	return result
}