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LibJS: Add Math.sign()

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This commit is contained in:
Linus Groh 2020-05-18 14:35:41 +01:00 • committed by Andreas Kling
parent bdfd1f1545
commit b27834cf16
3 changed files with 60 additions and 0 deletions
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17
Libraries/LibJS/Runtime/MathObject.cpp
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@ -50,6 +50,7 @@ MathObject::MathObject()
put_native_function("cos", cos, 1, attr);
put_native_function("tan", tan, 1, attr);
put_native_function("pow", pow, 2, attr);
put_native_function("sign", sign, 1, attr);
put("E", Value(M_E), 0);
put("LN2", Value(M_LN2), 0);
@ -206,4 +207,20 @@ Value MathObject::pow(Interpreter& interpreter)
return exp(interpreter, interpreter.argument(0), interpreter.argument(1));
}
Value MathObject::sign(Interpreter& interpreter)
{
auto number = interpreter.argument(0).to_number(interpreter);
if (interpreter.exception())
return {};
if (number.is_positive_zero())
return Value(0);
if (number.is_negative_zero())
return Value(-0.0);
if (number.as_double() > 0)
return Value(1);
if (number.as_double() < 0)
return Value(-1);
return js_nan();
}
}

1
Libraries/LibJS/Runtime/MathObject.h
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@ -51,6 +51,7 @@ private:
static Value cos(Interpreter&);
static Value tan(Interpreter&);
static Value pow(Interpreter&);
static Value sign(Interpreter&);
};
}

42
Libraries/LibJS/Tests/Math.sign.js Normal file
View file

@ -0,0 +1,42 @@
load("test-common.js");
function isPositiveZero(value) {
return value === 0 && 1 / value === Infinity;
}
function isNegativeZero(value) {
return value === 0 && 1 / value === -Infinity;
}
try {
assert(Math.sign.length === 1);
assert(Math.sign(0.0001) === 1);
assert(Math.sign(1) === 1);
assert(Math.sign(42) === 1);
assert(Math.sign(Infinity) === 1);
assert(isPositiveZero(Math.sign(0)));
assert(isPositiveZero(Math.sign(null)));
assert(isPositiveZero(Math.sign('')));
assert(isPositiveZero(Math.sign([])));
assert(Math.sign(-0.0001) === -1);
assert(Math.sign(-1) === -1);
assert(Math.sign(-42) === -1);
assert(Math.sign(-Infinity) === -1);
assert(isNegativeZero(Math.sign(-0)));
assert(isNegativeZero(Math.sign(-null)));
assert(isNegativeZero(Math.sign(-'')));
assert(isNegativeZero(Math.sign(-[])));
assert(isNaN(Math.sign()));
assert(isNaN(Math.sign(undefined)));
assert(isNaN(Math.sign([1, 2, 3])));
assert(isNaN(Math.sign({})));
assert(isNaN(Math.sign(NaN)));
assert(isNaN(Math.sign("foo")));
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}