Q261. What is modules in TypeScript?
Modules in TypeScript allow you to organize and encapsulate code into separate files. By using the `export` keyword, you can make specific code elements accessible to oth...
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Q262. How do you reuse information across service worker restarts?
The problem with service worker is that it gets terminated when not in use, and restarted when it's next needed, so you cannot rely on global state within a service worke...
Q263. What are stateful components?
If the behaviour of a component is dependent on the _state_ of the component then it can be termed as stateful component. These _stateful components_ are either function ...
Q264. Which are aggregate functions?
**Aggregate functions** perform a computation on a set of values across multiple rows and return a single summarizing value: ### Core Standard Aggregate Functions: 1. **`...
Q265. What is the use of "target" attribute in HTML?
The **`target`** attribute on ``, ``, or `` tags specifies where to display the linked document or form submission response: ### Permitted Keywords: - **`_self` (Default)...
Q266. What is IndexedDB?
IndexedDB is a low-level API for client-side storage of larger amounts of structured data, including files/blobs. This API uses indexes to enable high-performance searche...
Q267. How to apply validation on props in React?
When the application is running in _development mode_, React will automatically check all props that we set on components to make sure they have _correct type_. If the ty...
Q268. Return number of records in Customers?
To return the total count of rows in the `Customers` table, use **`COUNT(*)`**: ```sql SELECT COUNT(*) AS total_customers FROM Customers; ``` ### `COUNT(*)` vs `COUNT(col...
Q269. What is the use of "em" tag?
The "em" tag is a semantic tag which is used to apply emphasis to a word or phrase within a paragraph. Example: The sentence "I really enjoyed cycling" could be written u...
Q270. What is web storage?
Web storage is an API that provides a mechanism by which browsers can store key/value pairs locally within the user's browser, in a much more intuitive fashion than using...