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LibJS: Add spec comments and check for edge cases in Math.acosh
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2 changed files with 19 additions and 3 deletions
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@ -297,10 +297,23 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::acos)
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// 21.3.2.3 Math.acosh ( x ), https://tc39.es/ecma262/#sec-math.acosh
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JS_DEFINE_NATIVE_FUNCTION(MathObject::acosh)
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{
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auto value = TRY(vm.argument(0).to_number(vm)).as_double();
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if (value < 1)
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// 1. Let n be ? ToNumber(x).
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auto number = TRY(vm.argument(0).to_number(vm));
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// 2. If n is NaN or n is +∞𝔽, return n.
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if (number.is_nan() || number.is_positive_infinity())
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return number;
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// 3. If n is 1𝔽, return +0𝔽.
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if (number.as_double() == 1.0)
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return Value(0.0);
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// 4. If n < 1𝔽, return NaN.
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if (number.as_double() < 1)
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return js_nan();
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return Value(::acosh(value));
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// 5. Return an implementation-approximated Number value representing the result of the inverse hyperbolic cosine of ℝ(n).
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return Value(::acosh(number.as_double()));
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}
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// 21.3.2.4 Math.asin ( x ), https://tc39.es/ecma262/#sec-math.asin
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