Functions are the other fundamental elements of the language. A data type whose instances are unique and immutable.Īlthough these data types are relatively few, they enable you to perform useful operations with your applications. A sequence of characters that represent a text value. A top-level property whose value is not defined. (Because JavaScript is case-sensitive, null is not the same as Null, NULL, or any other variant.) The latest ECMAScript standard defines eight data types: Warning: unreachable code after return statement.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.TypeError: invalid assignment to const "x".TypeError: invalid 'instanceof' operand 'x'.
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