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LibJS: Add spec comments and check for edge cases in Math.atanh

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davidot 2022-11-28 12:02:45 +01:00 • committed by Andreas Kling
parent 68aeeea5d2
commit c565cbd30c
2 changed files with 22 additions and 3 deletions
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23
Userland/Libraries/LibJS/Runtime/MathObject.cpp
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@ -364,10 +364,27 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::atan)
// 21.3.2.7 Math.atanh ( x ), https://tc39.es/ecma262/#sec-math.atanh
JS_DEFINE_NATIVE_FUNCTION(MathObject::atanh)
{
auto value = TRY(vm.argument(0).to_number(vm)).as_double();
if (value > 1 || value < -1)
// 1. Let n be ? ToNumber(x).
auto number = TRY(vm.argument(0).to_number(vm));
// 2. If n is NaN, n is +0𝔽, or n is -0𝔽, return n.
if (number.is_nan() || number.is_positive_zero() || number.is_negative_zero())
return number;
// 3. If n > 1𝔽 or n < -1𝔽, return NaN.
if (number.as_double() > 1. || number.as_double() < -1.)
return js_nan();
return Value(::atanh(value));
// 4. If n is 1𝔽, return +∞𝔽.
if (number.as_double() == 1.)
return js_infinity();
// 5. If n is -1𝔽, return -∞𝔽.
if (number.as_double() == -1.)
return js_negative_infinity();
// 6. Return an implementation-approximated Number value representing the result of the inverse hyperbolic tangent of ℝ(n).
return Value(::atanh(number.as_double()));
}
// 21.3.2.21 Math.log1p ( x ), https://tc39.es/ecma262/#sec-math.log1p