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

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davidot 2022-11-28 12:08:57 +01:00 • committed by Andreas Kling
parent 8de8742b7c
commit bf1b2d63c6
2 changed files with 13 additions and 2 deletions
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13
Userland/Libraries/LibJS/Runtime/MathObject.cpp
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@ -636,13 +636,22 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::cosh)
// 21.3.2.34 Math.tanh ( x ), https://tc39.es/ecma262/#sec-math.tanh
JS_DEFINE_NATIVE_FUNCTION(MathObject::tanh)
{
// 1. Let n be ? ToNumber(x).
auto number = TRY(vm.argument(0).to_number(vm));
if (number.is_nan())
return js_nan();
// 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 is +∞𝔽, return 1𝔽.
if (number.is_positive_infinity())
return Value(1);
// 4. If n is -∞𝔽, return -1𝔽.
if (number.is_negative_infinity())
return Value(-1);
// 5. Return an implementation-approximated Number value representing the result of the hyperbolic tangent of ℝ(n).
return Value(::tanh(number.as_double()));
}