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LibJS: Add Math.sign()

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Linus Groh 2020-05-18 14:35:41 +01:00 • committed by Andreas Kling
parent bdfd1f1545
commit b27834cf16
Notes: sideshowbarker 2024-07-19 06:29:33 +09:00
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();
}
}