20 lines
497 B
JavaScript
20 lines
497 B
JavaScript
assert.equal(null ?? undefined, undefined);
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assert.equal(undefined ?? null, null);
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assert.equal(false ?? true, false);
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assert.equal(0 ?? 1, 0);
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assert.equal("" ?? "foo", "");
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var obj = { exists: true };
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assert.equal(obj.exists ?? false, true);
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assert.equal(obj.doesNotExist ?? "foo", "foo");
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var counter = 0;
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function sideEffect() { return counter++; }
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assert.equal(sideEffect() ?? -1, 0);
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var counter2 = 0;
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var obj2 = {
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get foo() { return counter2++; }
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};
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assert.equal(obj2.foo ?? -1, 0);
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