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LibJS: Add short circuit logical evaluation

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When evaluating logical binop expressions, the rhs must not be
evaluated if the lhs leads to the whole expression not being
truthy.
This commit is contained in:
Stephan Unverwerth 2020-04-03 19:11:31 +02:00 • committed by Andreas Kling
parent a2b0cc8f08
commit 520311eb8b
2 changed files with 28 additions and 4 deletions
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15
Libraries/LibJS/Tests/logical-expressions-short-circuit.js Normal file
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@ -0,0 +1,15 @@
function assert(x) { if (!x) throw 1; }
try {
let foo = 1;
false && (foo = 2);
assert(foo === 1);
foo = 1;
true || (foo = 2);
assert(foo === 1);
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}