Nevertheless, code fragments like -123.4 are fine, being interpreted as a unary - operator applied to the numeric literal 123.4. Note that the language specification requires numeric literals to be unsigned. JavaScript numeric literals include integer literals in different bases as well as floating-point literals in base-10. While functions are technically a kind of object, you can think of objects as named containers for values, and functions as procedures that your script can perform. 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'.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: "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.
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