Q711. What are the array detection mutation methods?
As the name suggests, mutation methods modifies the original array. Below are the list of array mutation methods which trigger view updates. 1. push() 2. pop() 3. shift()...
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Q712. What does ISNULL(price, 50) return if price is NULL?
If `price` is `NULL`, `ISNULL(price, 50)` evaluates to **`50`**. ### Function Nuances Across Databases: 1. **SQL Server**: `ISNULL(check_expression, replacement_value)` r...
Q713. What is unit test in Python?
A unit testing framework in Python is known as unittest. It supports sharing of setups, automation testing, shutdown code for tests, aggregation of tests into collections...
Q714. What is the difference between HTML form's "action" and "method" attributes?
The "action" attribute specifies the URL to which the form data is submitted, while the "method" attribute specifies the HTTP method when submitting the form data(either ...
Q715. What is optional properties in an interface in TypeScript?
In TypeScript, you can define optional properties in an interface by appending a question mark (?) to the property name. This indicates that the property is optional and ...
Q716. What is an IIFE (Immediately Invoked Function Expression)?
IIFE (Immediately Invoked Function Expression) is a JavaScript function that runs as soon as it is defined. The signature of it would be as below, ```javascript (function...
Q717. What is Lifting State Up in React?
When several components need to share the same changing data then it is recommended to _lift the shared state up_ to their closest common ancestor. That means if two chil...
Q718. What is the useRouter hook in Next.js?
A hook that allows access to the router object and perform navigation. The `useRouter` hook allows you to programmatically change routes inside **client** components.
Q719. What are the array detection non-mutation methods?
The methods which do not mutate the original array but always return a new array are called non-mutation methods. Below are the list of non-mutation methods, 1. filter() ...
Q720. Which operator searches text patterns?
`LIKE` with wildcards `%` (zero or more chars) and `_` (single char). ```sql WHERE name LIKE 'A%' -- starts with A WHERE name LIKE '%a%' -- contains a WHERE name LIKE '_a...