Query parameters are appended after the URL path, starting with a `?`. They are used to filter, sort, or modify the resources.
A technique that allows you to chain multiple promises together, where each subsequent promise depends on the result of the previous one.
Method hasOwnProperty is often preferred when you want to check only the object itself, while the in operator is useful when you want to check the entire prototype chain.
If there are multiple pieces of data that are logically related to each other, it makes sense to group them together and return them as a single unit.
Adding leading zeros to a number is often necessary in scenarios where the representation of the number needs to have a fixed width or format.