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/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/licenses/publicdomain/ */
var m = new Map;
// Symbols can be Map keys.
var sym = Symbol();
m.set(sym, "zero");
assertEq(m.has(sym), true);
assertEq(m.get(sym), "zero");
assertEq(m.has(Symbol()), false);
assertEq(m.get(Symbol()), undefined);
assertEq([...m][0][0], sym);
m.set(sym, "replaced");
assertEq(m.get(sym), "replaced");
m.delete(sym);
assertEq(m.has(sym), false);
assertEq(m.size, 0);
// Symbols returned by Symbol.for() can be Map keys.
for (var word of "that that is is that that is not is not is that not it".split(' ')) {
sym = Symbol.for(word);
m.set(sym, (m.get(sym) || 0) + 1);
}
assertDeepEq([...m], [
[Symbol.for("that"), 5],
[Symbol.for("is"), 5],
[Symbol.for("not"), 3],
[Symbol.for("it"), 1]
]);
if (typeof reportCompare === "function")
reportCompare(0, 0);
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