50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
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package slices
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import "reflect"
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type MapItem struct {
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Key, Elem interface{}
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}
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// Creates a []struct{Key K; Value V} for map[K]V.
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func FromMap(m interface{}) (slice []MapItem) {
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mapValue := reflect.ValueOf(m)
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for _, key := range mapValue.MapKeys() {
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slice = append(slice, MapItem{key.Interface(), mapValue.MapIndex(key).Interface()})
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}
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return
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}
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// Returns all the elements []T, from m where m is map[K]T.
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func FromMapElems(m interface{}) interface{} {
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inValue := reflect.ValueOf(m)
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outValue := reflect.MakeSlice(reflect.SliceOf(inValue.Type().Elem()), inValue.Len(), inValue.Len())
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for i, key := range inValue.MapKeys() {
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outValue.Index(i).Set(inValue.MapIndex(key))
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}
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return outValue.Interface()
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}
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// Returns all the elements []K, from m where m is map[K]T.
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func FromMapKeys(m interface{}) interface{} {
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inValue := reflect.ValueOf(m)
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outValue := reflect.MakeSlice(reflect.SliceOf(inValue.Type().Key()), inValue.Len(), inValue.Len())
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for i, key := range inValue.MapKeys() {
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outValue.Index(i).Set(key)
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}
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return outValue.Interface()
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}
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// f: (T)T, input: []T, outout: []T
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func Map(f, input interface{}) interface{} {
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inputValue := reflect.ValueOf(input)
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funcValue := reflect.ValueOf(f)
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_len := inputValue.Len()
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retValue := reflect.MakeSlice(reflect.TypeOf(input), _len, _len)
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for i := 0; i < _len; i++ {
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out := funcValue.Call([]reflect.Value{inputValue.Index(i)})
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retValue.Index(i).Set(out[0])
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}
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return retValue.Interface()
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}
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