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LibJS: Implement nullish coalescing operator (??)

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This commit is contained in:
Linus Groh 2020-04-18 00:49:11 +01:00 • committed by Andreas Kling
parent 1806592d58
commit d14ddb6461
4 changed files with 60 additions and 12 deletions
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39
Libraries/LibJS/Tests/logical-expressions-basic.js
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@ -17,7 +17,6 @@ try {
assert(("foo" && true) === true);
assert((false && "bar") === false);
assert((true && "bar") === "bar");
assert((null && true) === null);
assert((0 && false) === 0);
assert((0 && true) === 0);
assert((42 && false) === false);
@ -55,7 +54,6 @@ try {
assert(("foo" || true) === "foo");
assert((false || "bar") === "bar");
assert((true || "bar") === true);
assert((null || true) === true);
assert((0 || false) === false);
assert((0 || true) === true);
assert((42 || false) === 42);
@ -77,6 +75,43 @@ try {
assert((false || undefined) === undefined);
assert((true || undefined) === true);
assert((true ?? true) === true);
assert((false ?? false) === false);
assert((true ?? false) === true);
assert((false ?? true) === false);
assert((false ?? (1 === 2)) === false);
assert((true ?? (1 === 2)) === true);
assert(("" ?? "") === "");
assert(("" ?? false) === "");
assert(("" ?? true) === "");
assert((false ?? "") === false);
assert((true ?? "") === true);
assert(("foo" ?? "bar") === "foo");
assert(("foo" ?? false) === "foo");
assert(("foo" ?? true) === "foo");
assert((false ?? "bar") === false);
assert((true ?? "bar") === true);
assert((0 ?? false) === 0);
assert((0 ?? true) === 0);
assert((42 ?? false) === 42);
assert((42 ?? true) === 42);
assert((false ?? 0) === false);
assert((true ?? 0) === true);
assert((false ?? 42) === false);
assert((true ?? 42) === true);
assert(([] ?? false).length === 0);
assert(([] ?? true).length === 0);
assert((false ?? []) === false);
assert((true ?? []) === true);
assert((null ?? false) === false);
assert((null ?? true) === true);
assert((false ?? null) === false);
assert((true ?? null) === true);
assert((undefined ?? false) === false);
assert((undefined ?? true) === true);
assert((false ?? undefined) === false);
assert((true ?? undefined) === true);
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);