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LibJS: Add global isNaN() function

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This commit is contained in:
Andreas Kling 2020-03-27 12:45:36 +01:00
parent 9a78b4af2c
commit 04ced9e24a
2 changed files with 9 additions and 0 deletions
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5
Libraries/LibJS/Runtime/GlobalObject.cpp
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@ -18,6 +18,11 @@ GlobalObject::GlobalObject()
this_object->heap().collect_garbage(); this_object->heap().collect_garbage();
return js_undefined(); return js_undefined();
}); });
put_native_function("isNaN", [](Object*, Vector<Value> arguments) -> Value {
if (arguments.size() < 1)
return js_undefined();
return Value(arguments[0].is_nan());
});
put("Math", heap().allocate<MathObject>()); put("Math", heap().allocate<MathObject>());
} }

4
Libraries/LibJS/Tests/NaN-basic.js
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@ -3,6 +3,10 @@ function assert(x) { if (!x) throw 1; }
try { try {
var nan = undefined + 1; var nan = undefined + 1;
assert(nan + "" == "NaN"); assert(nan + "" == "NaN");
assert(isNaN(nan) === true);
assert(isNaN(0) === false);
assert(isNaN(undefined) === false);
assert(isNaN(null) === false);
console.log("PASS"); console.log("PASS");
} catch (e) { } catch (e) {
console.log("FAIL: " + e); console.log("FAIL: " + e);