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![undefined](https://m.media-amazon.com/images/S/aplus-media-library-service-media/e9a6735c-c856-46b3-8963-9bf896db236e.__CR0,0,800,600_PT0_SX800_V1___.jpg)
![Undefined symbols and where to find them, by Alex Nadein](https://miro.medium.com/v2/resize:fit:771/1*qLWvkwLKZJvXEf_AHvVXwg.png)
Undefined symbols and where to find them, by Alex Nadein
![Cannot read properties of undefined (reading '0') in JS](https://bobbyhadz.com/images/blog/javascript-cannot-read-property-0-of-undefined/provide-fallback-value-when-variable-is-undefined.webp)
Cannot read properties of undefined (reading '0') in JS
![undefined and null in JavaScript Explained](https://blog.alexdevero.com/wp-content/uploads/2021/02/01-02-21-undefined-and-null-in-javascript-explained-blog.jpg)
undefined and null in JavaScript Explained
![javascript - How to check if a variable or object is undefined? - Stack Overflow](https://i.stack.imgur.com/7JIQm.png)
javascript - How to check if a variable or object is undefined? - Stack Overflow
![The Difference Between null and undefined in JavaScript - Webtips](https://allma.si/blog/wp-content/uploads/2021/01/null-vs-undefined.png)
The Difference Between null and undefined in JavaScript - Webtips
![Slope - Zero Slope Versus Undefined Slope](https://i.ytimg.com/vi/uRe3JNrx7YE/hqdefault.jpg)
Slope - Zero Slope Versus Undefined Slope
![Understanding null, undefined and NaN., by Kuba Michalski](https://miro.medium.com/v2/resize:fit:1238/1*pdQQGOvCnfbyul2OKqNOrg.png)
Understanding null, undefined and NaN., by Kuba Michalski
![Notice: Undefined Index error in PHP](https://i.stechies.com/userfiles/images/PHP-Notice-Undefined-Index(1).webp)
Notice: Undefined Index error in PHP
![Undefined & Zero Slope Graph, Definition & Examples - Lesson](https://study.com/cimages/multimages/16/0g4tvzn.png)
Undefined & Zero Slope Graph, Definition & Examples - Lesson
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