Cybage Reactjs Developer Interview Questions and Answers

Q1. React Component updates promises in js fetch and axios api redux architecture redux reducers
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Q1. JavaScript coding questions
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React and Javascript

Coding test with technical discussion

Q1. All Basic questions related DOM, Virtual dom, DOM Manipulation, Redux Thunk saga, data flow, CSS different question like different way to place element in center, DOM node space, hidden/none different. In...read more
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Q1. What is Event loop
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Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.
• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows for non-blocking execution of code by moving asynchronous tasks to the event queue.

• Event loop continuously checks the call stack and the event queue, moving tasks from the queue to the stack when the stack is empty.

• Exa...read more
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Q2. What are closures
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Closures are functions that have access to their own scope, as well as the scope in which they were defined.
• Closures allow functions to access variables from their outer scope even after the outer function has finished executing.

• They are commonly used to create private variables in JavaScript.

• Closures are created whenever a function is defined within another function.
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Q1. Explain about Event Loop
Ans. 
Event Loop is a mechanism in JavaScript that allows asynchronous operations to be executed in a non-blocking way.
• Event Loop is responsible for handling the execution of code, callbacks, and I/O operations in JavaScript.

• It continuously checks the call stack for any pending tasks and executes them in a sequential manner.

• Event Loop ensures that the JavaScript engine is not blocked by long-running tasks, allowing for a smo...read more
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Q2. Explain about Promises in Javascript
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Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.

• Example: const myPromise = new Promise((resolve, reject) => { ... });
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