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for (auto entry : m) {
std::cout << entry.first << ": " << entry.second << "\n";
}Range-based for loop since C++11.
print(m);IO.inspect mconsole.log(m);m.forEach((k, v) -> {
out.println(k + " = " + v);
});print "$_: $m{$_}\n" for keys %m;print(m)puts m