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sorted.go
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sorted.go
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// Copyright 2016 CoreOS, Inc.
//
// 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 maps
import (
"reflect"
"sort"
"github.com/coreos/mantle/lang/natsort"
)
// Keys returns a map's keys as an unordered slice of strings.
func Keys(m interface{}) []string {
mapValue := reflect.ValueOf(m)
// Value.String() isn't sufficient to assert the keys are strings.
if mapValue.Type().Key().Kind() != reflect.String {
panic("maps: keys must be strings")
}
keyValues := mapValue.MapKeys()
keys := make([]string, len(keyValues))
for i, k := range keyValues {
keys[i] = k.String()
}
return keys
}
// SortedKeys returns a map's keys as a sorted slice of strings.
func SortedKeys(m interface{}) []string {
keys := Keys(m)
sort.Strings(keys)
return keys
}
// NaturalKeys returns a map's keys as a natural sorted slice of strings.
// See github.com/coreos/mantle/lang/natsort
func NaturalKeys(m interface{}) []string {
keys := Keys(m)
natsort.Strings(keys)
return keys
}