Red-Black Trees: Construction Shortcuts

First, let us look at conveniences which let us streamline our code a bit. Instead of just assigning a short synonym to string_map we can include it, dumping all of its exported symbols directly into our local namespace. Doing this with very many packages will make your local namespace a hopeless mess, but it makes sense to do now and then when you are using a particular package quite heavily.

Also, instead of using the set function we can use the shorter binary-operator synonym $ for it:

    #!/usr/bin/mythryl

    include string_map;

    m = (empty: Map( String ));

    m = m $ ("Key1", "Value1");
    m = m $ ("Key2", "Value2");
    m = m $ ("Key3", "Value3");

    printf "%s -> %s\n"  "Key1"  (the (get (m, "Key1")) );
    printf "%s -> %s\n"  "Key2"  (the (get (m, "Key2")) );
    printf "%s -> %s\n"  "Key3"  (the (get (m, "Key3")) );

The run is unchanged:

    linux$ ./my-script
    Key1 -> Value1
    Key2 -> Value2
    Key3 -> Value3

Like C, Mythryl lets us abbreviate constructs like

    foo = foo $ bar;

as simply

    foo $= bar;

We can make our above script even a bit more compact by using this contraction. This is satisfyingly concise when used in code doing a lot of data accumulation in trees:

    #!/usr/bin/mythryl

    include string_map;

    m = (empty: Map( String ));

    m $= ("Key1", "Value1");
    m $= ("Key2", "Value2");
    m $= ("Key3", "Value3");

    printf "%s -> %s\n"  "Key1"  (the (get (m, "Key1")) );
    printf "%s -> %s\n"  "Key2"  (the (get (m, "Key2")) );
    printf "%s -> %s\n"  "Key3"  (the (get (m, "Key3")) );

The run is again unchanged:

    linux$ ./my-script
    Key1 -> Value1
    Key2 -> Value2
    Key3 -> Value3