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Q: What is the output of console.log([, , ,].length) ?
Q: What is an “own property”?
It is a property directly assigned to the object instead of only being accessible from the object's prototype.
Q: Provide examples of non-boolean values that will coerce to a boolean one.
When any of the following values are coerced to a boolean, they will evaluate as “false”.
Any other value will coerce to “true”.
Q: Explain what is Hoisting.
A way of thinking about hoisting suggests that variable and function declarations are physically moved to the top of your code but they aren’t actually moving. They are put into memory during the compile phase.
Q: Explain what can we improve in the following code snippet:
This question can have different correct answers. What we could do, for example, is:
Note: Refactor is cool. Different developers can write different versions of this code and propose refactorings. The main objective here is to understand that when handling async code we need to use the "await" carefully in order to not create performance issues.
Q: What are cookies, why are useful, and how you use them?
Cookies are small data stored on a user's computer that can be accessed by the browser.
Cookies Can be used to remember important information that improves user experience, such as let websites remember user's sessions, save shopping carts, and more.
To create a cookie you can do this:
And retrieve it like this:
Important: `document.cookie` is a string that can contain a lot of key pairs, so you need to process the string to get the values you want.
Q: Explain what is class inheritance and give a short example.
Class inheritance is a good way to reuse code, we have to use the `extend` keyword to create a class inheritance.