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

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davidot 2022-11-28 12:03:41 +01:00 • committed by Andreas Kling
parent c565cbd30c
commit d4e5644df8
2 changed files with 19 additions and 3 deletions
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19
Userland/Libraries/LibJS/Runtime/MathObject.cpp
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@ -390,10 +390,23 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::atanh)
// 21.3.2.21 Math.log1p ( x ), https://tc39.es/ecma262/#sec-math.log1p
JS_DEFINE_NATIVE_FUNCTION(MathObject::log1p)
{
auto value = TRY(vm.argument(0).to_number(vm)).as_double();
if (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, n is -0𝔽, or n is +∞𝔽, return n.
if (number.is_nan() || number.is_positive_zero() || number.is_negative_zero() || number.is_positive_infinity())
return number;
// 3. If n is -1𝔽, return -∞𝔽.
if (number.as_double() == -1.)
return js_negative_infinity();
// 4. If n < -1𝔽, return NaN.
if (number.as_double() < -1.)
return js_nan();
return Value(::log1p(value));
// 5. Return an implementation-approximated Number value representing the result of the natural logarithm of 1 + ℝ(n).
return Value(::log1p(number.as_double()));
}
// 21.3.2.9 Math.cbrt ( x ), https://tc39.es/ecma262/#sec-math.cbrt