Q691. How can you enforce strict null checks in TypeScript?
To enforce strict null checks in TypeScript, you can enable the "strictNullChecks" compiler option in the tsconfig.json file. When enabled, TypeScript will check for null...
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Q692. What is the reason to choose the name let as a keyword?
The keyword `let` was chosen because it originates from mathematical notation, where "let" is used to introduce new variables (for example, "let x = 5"). This term was ad...
Q693. What are controlled components?
A **controlled component** is a React component that **fully manages the form element's state**(e.g, elements like ``, ``, or ``)) using React's internal state mechanism....
Q694. How do fetch cache options work in the App Router?
The `fetch` API in server components supports caching controls via `{ next: { revalidate } }` and cache modes like `cache: 'no-store'` or `cache: 'force-cache'`. Use `no-...
Q695. Why should not use if and for directives together on the same element?
It is recommended not to use v-if on the same element as v-for. Because v-if directive has a higher priority than v-for. There are two cases where developers try to use t...
Q696. Select records where FirstName="John" AND LastName="Jackson"?
To retrieve records that satisfy multiple simultaneous criteria, use the **`AND`** logical conjunction operator: ```sql SELECT * FROM Customers WHERE FirstName = 'John' A...
Q697. What is pass in Python?
Pass means, no-operation Python statement, or in other words it is a place holder in compound statement, where there should be a blank left and nothing has to be written ...
Q698. What is the canvas element in HTML5?
The **``** element provides a scriptable bitmap drawing surface in HTML. It acts as an empty resolution-dependent drawing container that JavaScript manipulates via proced...
Q699. What is the "readonly" modifier in TypeScript, and how does it affect properties and arrays?
The "readonly" modifier in TypeScript is used to make properties or array elements read-only, meaning they cannot be modified once initialized. It provides a way to enfor...
Q700. How do you redeclare variables in a switch block without an error?
When you try to redeclare variables using `let` or `const` in multiple `case` clauses of a `switch` statement, you will get a SyntaxError. This happens because, in JavaSc...