JavaScript
Tutorials:
Complete beginners
JavaScript Guide
Intermediate
Advanced
References:
Built-in objects
Expressions & operators
Statements & declarations
Functions
Classes
Errors
1. Warning: -file- is being assigned a //# sourceMappingURL, but already has one
2. TypeError: invalid Array.prototype.sort argument
3. Warning: 08/09 is not a legal ECMA-262 octal constant
4. RangeError: radix must be an integer
5. SyntaxError: invalid regular expression flag "x"
6. SyntaxError: return not in function
7. TypeError: X.prototype.y called on incompatible type
8. ReferenceError: can't access lexical declaration 'X' before initialization
9. TypeError: can't access property "x" of "y"
10. TypeError: can't assign to property "x" on "y": not an object
11. TypeError: can't define property "x": "obj" is not extensible
12. TypeError: property "x" is non-configurable and can't be deleted
13. TypeError: can't redefine non-configurable property "x"
14. TypeError: cyclic object value
15. TypeError: can't access dead object
16. SyntaxError: applying the 'delete' operator to an unqualified name is deprecated
17. ReferenceError: deprecated caller or arguments usage
18. Warning: expression closures are deprecated
19. SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated
20. SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead
21. Warning: String.x is deprecated; use String.prototype.x instead
22. Warning: Date.prototype.toLocaleFormat is deprecated
23. SyntaxError: test for equality (==) mistyped as assignment (=)?
24. TypeError: setting getter-only property "x"
25. SyntaxError: Unexpected '#' used outside of class body
26. SyntaxError: identifier starts immediately after numeric literal
27. SyntaxError: illegal character
28. TypeError: cannot use 'in' operator to search for 'x' in 'y'
29. RangeError: invalid array length
30. ReferenceError: invalid assignment left-hand side
31. TypeError: invalid assignment to const "x"
32. RangeError: invalid date
33. SyntaxError: for-in loop head declarations may not have initializers
34. SyntaxError: a declaration in the head of a for-of loop can't have an initializer
35. TypeError: invalid 'instanceof' operand 'x'
36. TypeError: 'x' is not iterable
37. SyntaxError: JSON.parse: bad parsing
38. SyntaxError: Malformed formal parameter
39. URIError: malformed URI sequence
40. SyntaxError: missing ] after element list
41. SyntaxError: missing : after property id
42. SyntaxError: missing } after function body
43. SyntaxError: missing } after property list
44. SyntaxError: missing formal parameter
45. SyntaxError: missing = in const declaration
46. SyntaxError: missing name after . operator
47. SyntaxError: missing ) after argument list
48. SyntaxError: missing ) after condition
49. SyntaxError: missing ; before statement
50. TypeError: More arguments needed
51. RangeError: repeat count must be non-negative
52. TypeError: "x" is not a non-null object
53. TypeError: "x" has no properties
54. SyntaxError: missing variable name
55. TypeError: can't delete non-configurable array element
56. RangeError: argument is not a valid code point
57. TypeError: "x" is not a constructor
58. TypeError: "x" is not a function
59. ReferenceError: "x" is not defined
60. RangeError: precision is out of range
61. Error: Permission denied to access property "x"
62. TypeError: "x" is read-only
63. SyntaxError: redeclaration of formal parameter "x"
64. TypeError: Reduce of empty array with no initial value
65. SyntaxError: "x" is a reserved identifier
66. RangeError: repeat count must be less than infinity
67. Warning: unreachable code after return statement
68. SyntaxError: "use strict" not allowed in function with non-simple parameters
69. InternalError: too much recursion
70. ReferenceError: assignment to undeclared variable "x"
71. ReferenceError: reference to undefined property "x"
72. SyntaxError: Unexpected token
73. TypeError: "x" is (not) "y"
74. SyntaxError: function statement requires a name
75. SyntaxError: unterminated string literal
Misc

Subtraction (-)