Mckinley Rice Reactjs Developer Interview Questions and Answers

Q1. React basics link version
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Basic ReactJs questions
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Q1. What is event loop?
Ans. 
Event loop is a mechanism that allows JavaScript to handle multiple tasks simultaneously.
• Event loop is a part of JavaScript runtime environment.

• It continuously checks the call stack and the task queue.

• If the call stack is empty, it takes the first task from the queue and pushes it to the call stack.

• Examples of tasks include DOM events, setTimeout, and AJAX requests.
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Q2. Whatbis clousers ?
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Closures are functions that have access to variables in their outer scope, even after the outer function has returned.
• Closures are created when a function is defined inside another function.

• The inner function has access to the outer function's variables, even after the outer function has returned.

• Closures can be used to create private variables and functions in JavaScript.

• Example: function outer() { let x = 10; functio...read more
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Q1. How React Works?
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React is a JavaScript library for building user interfaces that uses a virtual DOM to efficiently update the UI.
• React creates a virtual DOM to represent the UI components.

• When state or props change, React compares the virtual DOM with the actual DOM and updates only the necessary parts.

• React uses a component-based architecture to build reusable UI elements.

• React uses JSX, a syntax extension for JavaScript, to write com
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Q2. How Redux Works?
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Redux is a predictable state container for JavaScript apps.
• Redux stores the entire state of the application in a single immutable object.

• Actions are dispatched to describe state changes.

• Reducers specify how the state changes in response to actions.

• Components can subscribe to the Redux store to access the state.

• Redux helps manage the state of complex applications and makes it easier to debug and test.

• Example: dispatchin
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Q1. Flat the array without using the inbuilt methods
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Flatten an array without using inbuilt methods
• Use recursion to iterate through the array and flatten it

• Create a new array to store the flattened elements

• Check if each element is an array, if so, recursively call the function to flatten it
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Q2. Sort the given objects based on the ages
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