langref.org - cpp, csharp, and fantom - Maps

Given a map pets {joe:cat,mary:turtle,bill:canary} print "ok" if an pet exists for "mary"

cpp

if (pets->ContainsKey("mary")) Console::WriteLine("ok");

if (pets.find("mary") != pets.end()){
std::cout << "ok" << std::endl;
}

if (pets.count("mary") > 0)
cout << "ok" << endl;

fantom

map := ["joe":"cat", "mary":"turtle", "bill":"canary"]
if (map.containsKey("mary")) echo("ok")

Given a map pets {joe:cat,mary:turtle,bill:canary} print the pet for "joe" ("cat")

cpp

if (pets->ContainsKey("joe")) Console::WriteLine(pets["joe"]);

cout << pets["joe"] << endl;

fantom

map := ["joe":"cat", "mary":"turtle", "bill":"canary"]
pet := map["joe"]
echo("pet=$pet")

Given an empty pets map, add the mapping from "rob" to "dog"

cpp

pets->Add("rob", "dog");

pets["rob"] = "dog";

fantom

map["rob"] = "dog"

Given a map pets {joe:cat,mary:turtle,bill:canary} remove the mapping for "bill" and print "canary"

cpp

if (pets->ContainsKey("bill"))
{
String^ value = safe_cast<String^>(pets["bill"]); pets->Remove("bill");
Console::WriteLine("{0}", value);
}

fantom

pet := map.remove("bill")
echo ("pet=$pet")