Method Swap

models/book.go:98–98

(i, j int)

func (s BookNavs) Len() int { return len(s) }

func (s BookNavs) Swap(i, j int) { s[i], s[j] = s[j], s[i] }

func (s BookNavs) Less(i, j int) bool { return s[i].Sort < s[j].Sort }