update

slice_go1.18.go

@@ -2,6 +2,8 @@
 
 package com
 
+import "sort"
+
 type Number interface {
 	~uint8 | ~int8 | ~uint16 | ~int16 | ~uint32 | ~int32 | ~uint | ~int | ~uint64 | ~int64 | ~float32 | ~float64
 }
@@ -22,3 +24,16 @@ func SliceExtractCallback[T Scalar](parts []string, cb func(string) T, recv ...*
 		*recv[index] = cb(value)
 	}
 }
+
+type reverseSortIndex[T any] []T
+
+func (s reverseSortIndex[T]) Len() int { return len(s) }
+func (s reverseSortIndex[T]) Less(i, j int) bool {
+	return j < i
+}
+func (s reverseSortIndex[T]) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
+
+func ReverseSortIndex[T any](values []T) []T {
+	sort.Sort(reverseSortIndex[T](values))
+	return values
+}

slice_go1.18_test.go

@@ -16,3 +16,11 @@ func TestSliceExtractCallback(t *testing.T) {
 	assert.Equal(t, 2, n2N)
 	assert.Equal(t, 3, n3N)
 }
+
+func TestReverseSortIndex(t *testing.T) {
+	parts := []string{`1`, `2`, `3`}
+	ReverseSortIndex(parts)
+	assert.Equal(t, `3`, parts[0])
+	assert.Equal(t, `2`, parts[1])
+	assert.Equal(t, `1`, parts[2])
+}