Technical Question Bank · Peer-Reviewed
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (2,728 available).
The `useTransition` hook allows you to mark certain state updates as **non-urgent transitions**, keeping the UI responsive during expensive re-renders. It returns a `isPe...
The most robust and pythonic way to read and print file contents is using the **`with` statement** (context manager), which guarantees the file descriptor is safely close...
In ES5, we need to depend on logical OR operators to handle default values of function parameters. Whereas in ES6, Default function parameters feature allows parameters t...
The `useSyncExternalStore` hook is designed to **subscribe to external stores** (non-React state sources) in a way that's compatible with concurrent rendering. It's prima...
virtualenv is a tool to create isolated Python environments. virtualenv creates a folder which contains all the necessary executables to use the packages that a Python pr...
Template literals or template strings are string literals allowing embedded expressions. These are enclosed by the back-tick (`) character instead of double or single quo...
The `useInsertionEffect` hook is designed for **CSS-in-JS library authors** to inject styles into the DOM before any layout effects run. It fires synchronously before DOM...
In short, it lets you assign values to a variable in an outer (but non-global) scope. The nonlocal statement causes the listed identifiers to refer to previously bound va...
In ES5, you would have to use newline escape characters('\\n') and concatenation symbols(+) in order to get multi-line strings. ```javascript console.log("This is string ...
Custom hooks allow you to **extract and share stateful logic** between components without changing their hierarchy. The state itself is not shared—each component using th...
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