By-Field comparator in Go using reflection

reflection_CmpByFields.go

package blogpost

func CmpByFields[T any](names ...string) func(a, b T) int {
	cmp := func(a, b T) int {
		aVal := reflect.ValueOf(a)
		bVal := reflect.ValueOf(b)

		for _, name := range names {
			aField := aVal.FieldByName(name)
			bField := bVal.FieldByName(name)

			if aField.CanInt() {
				aInt := aField.Int()
				bInt := bField.Int()
				if aInt == bInt {
					continue
				} else if aInt < bInt {
					return -1
				} else {
					return 1
				}
			} else if aField.CanUint() {
				aUint := aField.Uint()
				bUint := bField.Uint()
				if aUint == bUint {
					continue
				} else if aUint < bUint {
					return -1
				} else {
					return 1
				}
			} else if aField.CanFloat() {
				aFloat := aField.Float()
				bFloat := bField.Float()
				if aFloat == bFloat {
					continue
				} else if aFloat < bFloat {
					return -1
				} else {
					return 1
				}
			} else if aField.Kind() == reflect.String {
				aString := aField.String()
				bString := bField.String()
				if aString == bString {
					continue
				} else if aString < bString {
					return -1
				} else {
					return 1
				}
			}
		}

		return 0
	}
	return cmp
}