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Complete List of 100 Javascript Error Codes/Messages – Explained!

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In the world of JavaScript development, encountering errors is an inevitable part of the journey. As programmers, we’ve all come face-to-face with those perplexing error messages that seem to hinder our progress and leave us scratching our heads. But fear not! Understanding and deciphering these error codes is key to becoming a proficient JavaScript developer.

In this comprehensive guide, we will unravel the mysteries behind 100 JavaScript error codes and provide clear explanations for each one. Whether you’re a seasoned developer or just starting your coding adventure, this article aims to demystify the most common errors and equip you with the knowledge to overcome them.

From the dreaded “ReferenceError: x is not defined” to the perplexing “TypeError: Cannot read property ‘x’ of null,” we’ll delve into the intricacies of each error message, shedding light on what causes them and how to resolve them. Our goal is to bridge the gap between cryptic error codes and practical solutions, empowering you to write cleaner, more efficient JavaScript code.

Throughout this journey, we’ll focus not only on the technical aspects but also on providing human-friendly explanations that make these error codes more approachable. We understand the frustration that arises when faced with a wall of incomprehensible jargon, so we’ve crafted this guide to be accessible to developers of all levels.

So, whether you’re seeking to sharpen your troubleshooting skills or expand your JavaScript knowledge, join us as we dive into the world of JavaScript error codes. By the end of this article, you’ll be equipped with the insights needed to tackle these errors head-on and pave the way for smoother, bug-free JavaScript programming.

Let’s embark on this enlightening journey through the realm of JavaScript errors together!

Understanding JavaScript Error Messages

When writing JavaScript code, error messages act as valuable clues that guide us towards identifying and resolving issues within our programs. Error messages are generated by JavaScript’s runtime environment when it encounters an unexpected behavior or encounters code that violates the language’s syntax rules.

These error messages serve as informative notifications that help us pinpoint the source of the problem and understand what went wrong. By examining the error message, we can gain insights into the nature of the error, such as the type of error (e.g., TypeError, SyntaxError) and specific details regarding the problematic code snippet.

JavaScript error messages are designed to be as helpful as possible, providing developers with essential information to aid in debugging. They often consist of three key components:

  1. Error Type: The error type indicates the category of the error. Common error types include TypeError, SyntaxError, ReferenceError, and more. Understanding the error type can give us a clue about the nature of the issue.
  2. Error Message: The error message itself provides a brief description of what went wrong. It may reference specific variables, functions, or operations related to the error. By analyzing the error message, we can identify the area of code where the error occurred.
  3. Stack Trace: The stack trace is a detailed report that shows the sequence of function calls leading up to the point where the error occurred. It helps trace the execution flow and can be immensely useful in understanding the context of the error.

By carefully examining these components, we can effectively diagnose and address errors in our JavaScript code. Each error message is like a breadcrumb on the path to bug resolution, offering insights that guide us toward finding solutions.

List of 100 Javascript Error Messages

Error Message Explanation
1. ReferenceError: x is not defined This error occurs when you try to use a variable or object that has not been declared or is not within the current scope. Double-check the spelling and scope of your variables to ensure they are properly defined before using them.
2. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
3. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
4. RangeError: Invalid array length This error arises when you try to create an array with an invalid length. Ensure that the length you provide when initializing an array is a non-negative integer within the acceptable range.
5. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
6. TypeError: Cannot assign to read-only property 'x' of object This error indicates that you are trying to assign a new value to a read-only property (denoted by ‘x’) of an object. Check if the property is meant to be read-only and, if not, ensure that it is writable by modifying its configuration or redefining the object.
7. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
8. TypeError: Cannot read property 'length' of null This error occurs when you try to access the length property of a variable that is null or undefined. Make sure the variable is properly initialized and holds a value before attempting to access its length property.
9. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
10. SyntaxError: Missing initializer in const declaration This error indicates that you have declared a constant variable using the const keyword but haven’t provided an initial value. Constants must be assigned a value when declared. Make sure to assign an appropriate value to the constant variable.
11. ReferenceError: event is not defined This error typically occurs when you try to access the event object within a function, but it is not defined in the current scope. Ensure that the event object is available and properly passed as an argument or accessible through other means within the function.
12. TypeError: Cannot convert undefined or null to object This error arises when you attempt to perform an operation on a variable that is either undefined or null and requires it to be an object. Verify that the variable is properly initialized and holds an appropriate value before performing the operation.
13. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
14. TypeError: Cannot set property 'x' of undefined This error typically happens when you try to set the value of a property (denoted by ‘x’) on an undefined variable. Make sure the variable is properly defined and initialized before attempting to set its properties.
15. ReferenceError: Invalid left-hand side in assignment This error indicates that the left-hand side of an assignment operation is not valid. Check the expression on the left side of the assignment operator (=) to ensure that it can be assigned a value. It might be missing a variable or object reference, or you may have used an invalid expression.
16. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
17. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
18. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
19. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
20. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
21. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
22. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
23. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
24. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
25. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
26. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
27. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
28. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
29. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
30. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
31. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
32. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
33. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
34. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
35. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
36. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
37. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
38. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
39. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
40. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
41. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
42. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
43. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
44. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
45. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
46. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
47. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
48. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
49. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
50. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
51. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
52. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
53. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
54. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
55. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
56. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
57. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
58. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
59. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
60. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
61. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
62. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
63. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
64. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
65. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
66. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
67. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
68. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
69. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
70. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
71. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
72. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
73. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
74. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
75. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
76. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
77. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
78. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
79. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
80. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
81. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
82. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
83. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
84. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
85. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
86. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
87. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
88. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
89. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
90. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
91. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
92. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
93. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
94. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
95. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
96. TypeError: Cannot read property 'x' of null This error typically happens when you try to access a property (denoted by ‘x’) of a variable that is null or undefined. Make sure the variable is properly initialized and holds an object or value before accessing its properties.
97. TypeError: x is not a function This error occurs when you attempt to call a variable or object as a function (denoted by ‘x’) that is not a function type. Make sure the variable or object being called is indeed a function and not a different data type, such as a number or string.
98. SyntaxError: Unexpected token x This error indicates that JavaScript encountered an unexpected character or token (represented by ‘x’) in your code. Verify the syntax around the indicated token and make sure it aligns with the JavaScript language rules. Check for missing brackets, semicolons, or other syntax elements.
99. TypeError: Cannot read property 'x' of undefined This error typically occurs when you try to access a property (denoted by ‘x’) of an undefined variable. Ensure that the variable is properly defined and initialized before accessing its properties.
100. TypeError: x is not iterable This error arises when you attempt to iterate over an object (denoted by ‘x’) that is not iterable. Verify that the object you are trying to iterate over, such as an array or a collection, has the necessary iterator methods defined, such as Symbol.iterator, to support iteration.
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