dict

auto d = dict!(string, string)();
scope(exit) d.free();
d["Hell"] = "No";
d["Hello"] = "World";
d["Help"] = "Me";
d["Something"] = "Else";
assert(d["Hell"] == "No");
assert(d["Hello"] == "World");
assert(d["Help"] == "Me");
assert(d["Something"] == "Else");
assert("Held" !in d);
assert(d.length == 4);

string[string] elements;
foreach(key, value; d)
{
    elements[key] = value;
}
assert(elements["Hell"] == "No");
assert(elements["Hello"] == "World");
assert(elements["Help"] == "Me");
assert(elements["Something"] == "Else");
assert(elements.length == d.length);

d["Something"] = "New";
assert(d["Something"] == "New");

d.remove("Hell");
assert(d.length == 3);
assert(d.get("Hell") is null);

d.clear();
assert(d.length == 0);
assert("Hello" !in d);
assert("Help" !in d);
assert("Something" !in d);

d["Held"] = "Fire";
assert(d["Held"] == "Fire");

auto di = dict!(string, int);
scope(exit) di.free();
di[0xBEAF] = "BEAF";
di[0xDEADBEAF] = "DEADBEAF";
di[0xDEAD] = "DEAD";
assert(di[0xBEAF] == "BEAF");
assert(di[0xDEADBEAF] == "DEADBEAF");
assert(di[0xDEAD] == "DEAD");