Maps have been improved quite a bit.

For example, if you have a std::map<std::string, int>, you can iterate over it like this:

    for (auto [s, n]: my_map) {
        // s = string key, n = int value
    }

You can test for membership:

    if (my_map.contains(“foo”)) { /* do something * }

Although I still usually use find because if the key is in the map, I probably want the value.

You can use initialization lists with them too:

    std::map<std::string, int> my_map = {
      { “one”, 1 },
      { “two”, 2 },
      { “three”, 3 }
    };