BridgeFix Interview Questions and Answers

Q1. What is Hoisting
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable and function declarations are hoisted to the top of their scope.

• Only declarations are hoisted, not initializations.

• Function declarations take precedence over variable declarations.
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Q2. What is Virtual Dom
Ans. 
Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to determine the minimal updates needed.

• This process helps in reducing the number of updates to the ac...read more
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Q3. What is Difference between return and render
Ans. 
Return is used to send data back from a function, while render is used to display content on the screen.
• Return is used in functions to send back a value or result

• Render is used in web development to display content on the screen

• Return is used in programming languages like JavaScript, while render is specific to web development frameworks like React
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Q4. How can you pass data child component to the parent component
Ans. 
Using props and callback functions to pass data from child to parent component in React
• Passing data from child to parent can be achieved by defining a callback function in the parent component and passing it down to the child component as a prop

• The child component can then call this callback function with the data as an argument, allowing the parent component to update its state with the passed data

• Example: Parent comp...read more
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Q5. What is life Cycle methods
Ans. 
Lifecycle methods are special methods in React components that allow us to perform actions at specific points in the component's lifecycle.
• Lifecycle methods include componentDidMount, componentDidUpdate, componentWillUnmount, etc.

• componentDidMount is called after the component has been rendered to the DOM.

• componentDidUpdate is called after the component's updates have been flushed to the DOM.

• componentWillUnmount is cal...read more
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4 coding questions and 3 aptitude questions

Moderat level of coding test

In this round u have 6 coding questions which u can do 4 and 4aptidue reasoning questions