This section is dedicated to the JavaScript language itself, and not the parts that are specific to Web pages or other host environments. JavaScript's dynamic capabilities include runtime object construction, variable parameter lists, function variables, dynamic script creation (via eval), object introspection (via for.in and Object utilities), and source-code recovery (JavaScript functions store their source text and can be retrieved through toString()). JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat. JavaScript ( JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions.
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: 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.
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