TradeLeaves UI Developer Interview Questions, Process, and Tips

Q1. How React works
Ans. 
React is a JavaScript library for building user interfaces.
• React uses a virtual DOM to improve performance by only updating the necessary parts of the actual DOM.

• Components are the building blocks of React applications.

• React allows for reusable code through component composition.

• State and props are used to manage data and communication between components.

• React can be used with other libraries and frameworks like Redux
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Q2. How to store excel sheet in MongoDB
Ans. 
Excel sheets can be stored in MongoDB by converting them to JSON format and then inserting the JSON data into a MongoDB collection.
• Convert the Excel sheet data to JSON format using a library like pandas in Python or Apache POI in Java.

• Establish a connection to the MongoDB database using a MongoDB driver like pymongo for Python or MongoDB Java driver.

• Insert the JSON data into a MongoDB collection using the insert_one or
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Q1. What is bubbling in js
Ans. 
Bubbling is the process in which an event propagates from the innermost element to the outermost element in the DOM tree.
• Events in JavaScript propagate in two ways: bubbling and capturing.

• Bubbling is the default propagation mode in which an event is first captured by the innermost element and then propagated to the outermost element.

• Bubbling can be stopped using the stopPropagation() method.

• Example: Clicking on a butto...read more
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Q2. What is capturing in ES
Ans. 
Capturing in ES refers to the process of binding a value to a variable in a closure.
• Capturing allows a function to access variables outside of its own scope.

• This is achieved by creating a closure that contains the variable and its value.

• Captured variables can be modified by the function, but the original value remains unchanged.

• Example: const x = 5; function foo() { console.log(x); } foo(); // Output: 5

• Example: functio...read more
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