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LibJS: Add spec comments to is_strictly_equal()

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Linus Groh 2022-12-10 00:11:02 +00:00
parent abf1ba89cd
commit f1d8a64510
1 changed files with 13 additions and 0 deletions
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13
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -2181,20 +2181,33 @@ bool same_value_non_numeric(Value lhs, Value rhs)
// 7.2.15 IsStrictlyEqual ( x, y ), https://tc39.es/ecma262/#sec-isstrictlyequal
bool is_strictly_equal(Value lhs, Value rhs)
{
// 1. If Type(x) is different from Type(y), return false.
if (!same_type_for_equality(lhs, rhs))
return false;
// 2. If x is a Number, then
if (lhs.is_number()) {
// a. Return Number::equal(x, y).
// 6.1.6.1.13 Number::equal ( x, y ), https://tc39.es/ecma262/#sec-numeric-types-number-equal
// 1. If x is NaN, return false.
// 2. If y is NaN, return false.
if (lhs.is_nan() || rhs.is_nan())
return false;
// 3. If x is the same Number value as y, return true.
// 4. If x is +0𝔽 and y is -0𝔽, return true.
// 5. If x is -0𝔽 and y is +0𝔽, return true.
if (lhs.as_double() == rhs.as_double())
return true;
// 6. Return false.
return false;
}
// FIXME: This should be handled in SameValueNonNumber now (formerly SameValueNonNumeric)
if (lhs.is_bigint())
return lhs.as_bigint().big_integer() == rhs.as_bigint().big_integer();
// 3. Return SameValueNonNumber(x, y).
return same_value_non_numeric(lhs, rhs);
}