assert_equal([true, false, true], map([1,2,3], odd))



var m = ["a":1, "b":2];

assert_equal(1, m.count("a"))
assert_equal(0, m.count("c"))
assert_equal(1, m.erase("a"))
assert_equal(1, m.size())
assert_equal(0, m.erase("a"))

assert_equal(1, m.size());

var m2 = ["c":3, "b":4]
m.insert(m2);

assert_equal(3, m["c"])
// The inserted values do not overwrite the existing ones
assert_equal(2, m["b"])
assert_equal(2, m.size())

var v = "bob";

m.insert_ref(Map_Pair("d", v))

assert_equal("bob", m["d"])
v = "bob2"
assert_equal("bob2", m["d"])