OpenXcell Technolabs Software Engineer Interview Questions and Answers

Q1. What is promise?
Ans. 
A promise is an object representing the eventual completion or failure of an asynchronous operation.
• Promises are used in JavaScript to handle asynchronous operations.

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

• Promises can be chained together using .then() method.

• Example: Fetching data from an API returns a promise that resolves with the data.

• Example: Promises help avoid callback hell by providi...read more
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Q2. What is scope and how it differentiate?
Ans. 
Scope refers to the visibility and accessibility of variables in a program.
• Scope determines where in a program a variable can be accessed.

• Global scope refers to variables that can be accessed anywhere in the program.

• Local scope refers to variables that are only accessible within a specific block of code.

• Variables declared within a function have local scope.

• Scope can help prevent naming conflicts and improve code organi
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Q1. Reconcillation in react?
Ans. 
Reconciliation in React is the process of updating the virtual DOM to match the actual DOM.
• Reconciliation is the process of comparing the virtual DOM with the actual DOM and making necessary updates.

• React uses a diffing algorithm to efficiently update the DOM without re-rendering everything.

• Key prop is important for React to identify which items have changed, added, or removed during reconciliation.
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Q1. How you see yourself in next 5 years?
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Google meet in react they asked basics and node also must clear js