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Question 1. | |
A variable scope determines when variables can be assessed at different parts of the code. A variable in the global scope can be accessed anywhere in the code. On the other hand a variable in a block scope can only be accessed in the function it was defined in. | |
Question 2. | |
A global variable can lead to unexpected outcomes due to different parts of the code trying to use the same variable name. For example if a global variable was named xyz, but then a function creates another variable named xyz without using let, or const it can lead to many hard to fix bugs. | |
Question 3. | |
Strict mode prevent people from defining variables without using let or const. This stops people from creating global variables within their functions. | |
Question 4. |
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