![]() TypeError: invalid assignment to const "x".TypeError: invalid 'instanceof' operand 'x'.TypeError: cannot use 'in' operator to search for 'x' in 'y'.TypeError: can't redefine non-configurable property "x".TypeError: can't delete non-configurable array element.TypeError: can't define property "x": "obj" is not extensible.TypeError: can't convert BigInt to number.TypeError: can't assign to property "x" on "y": not an object.TypeError: "x" is not a non-null object.Synta圎rror: Using to indicate sourceURL pragmas is deprecated.Synta圎rror: unterminated string literal. ![]() Synta圎rror: unparenthesized unary expression can't appear on the left-hand side of '**'.Synta圎rror: unlabeled break must be inside loop or switch.Synta圎rror: Unexpected '#' used outside of class body.Synta圎rror: test for equality (=) mistyped as assignment (=)?.Synta圎rror: redeclaration of formal parameter "x".Synta圎rror: missing = in const declaration.Unicode character class escape: \p after property list.Character class escape: \d, \D, \w, \W, \s, \S.Enumerability and ownership of properties.The Undefined type is inhabited by exactly one value: undefined.Ĭonceptually, undefined indicates the absence of a value, while null indicates the absence of an object (which could also make up an excuse for typeof null = "object"). The object wrapper classes' reference pages contain more information about the methods and properties available for each type, as well as detailed descriptions for the semantics of the primitive types themselves. However, accessing a property on null or undefined throws a TypeError exception, which necessitates the introduction of the optional chaining operator. When a property is accessed on a primitive value, JavaScript automatically wraps the value into the corresponding wrapper object and accesses the property on the object instead. For example, the Number object provides methods like toExponential(). typeof null returns "object", so one has to use = null to test for null.Īll primitive types, except null and undefined, have their corresponding object wrapper types, which provide useful methods for working with the primitive values. We refer to values of these types as primitive values.Īll primitive types, except null, can be tested by the typeof operator. Warning: unreachable code after return statementĪll types except Object define immutable values represented directly at the lowest level of the language.Warning: -file- is being assigned a //# sourceMappingURL, but already has one.TypeError: X.prototype.y called on incompatible type.TypeError: setting getter-only property "x".TypeError: Reduce of empty array with no initial value.TypeError: property "x" is non-configurable and can't be deleted. ![]() ![]() ![]() ![]()
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