1 2 3 4
pub mod get; // [1 2 3 4], 1 -> get -> $int , {"a":1 "b":2} -> get -> $value pub mod has; // [1 2 3 4], 5 -> has -> $bool, {"a":1 "b":2} -> has -> $bool pub mod insert; // [1 2 3 4], 5 -> insert, {"a":1 "b":2}, {"c":3} -> insert pub mod remove; // [1 2 3 4], 2 -> remove, {"a":1, "b":2}, "b" -> remove