CleverTap Front end Engineer Interview Questions and Answers

Q1. Difference between null and object.
Ans. 
Null is absence of value while object is a collection of properties and methods.
• Null is a primitive value while object is a complex data type.

• Null is used to indicate absence of value while object is used to represent real-world entities.

• Null cannot have properties or methods while object can have both.

• Example of null: let x = null; Example of object: let person = { name: 'John', age: 30 };
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Q1. DSA question (Competitive programming)
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Q2. LLD question (Competetive)
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Q1. 1 LC medium question based on binary search
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Q2. Question related to resume.
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Q1. 2 coding questions 1 medium, 1 easy
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Q2. Asked various framework related fundamentals.
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Q1. Technical + Behavioral
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Q2. Behavioral round with manager
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Q1. What is CSP? what is nonce? Few coding problems make flat array, etc. Advance javascript questions.
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Q1. What is generator functions? what is symbols? write an implementation for const keyword to support in es05.
Ans. 
Generator functions and symbols in JavaScript. Implementation of const keyword in ES5.
• Generator functions are functions that can be paused and resumed, allowing for lazy evaluation of data.

• Symbols are a new primitive type in ES6 that can be used as unique identifiers.

• To implement const in ES5, we can use Object.defineProperty to create a read-only property on an object.
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Q2. Explain or write custom events with example.
Ans. 
Custom events are user-defined events that can be triggered in a software application.
• Custom events can be defined using event listeners and dispatchers.

• They can be used to track user behavior, monitor application performance, and trigger specific actions.

• Examples of custom events include button clicks, form submissions, and page scrolls.
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Q1. Complete Code for Ludo Game. Sort of Machine coding round.
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Q2. Given an array of intervals and return the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping.
Ans. 
Remove overlapping intervals to minimize removals.
• Sort intervals by end time

• Iterate through intervals, remove overlapping intervals

• Return count of removed intervals
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Q1. Explain joins in SQL
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple tables based on a related column between them

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from the right table

• ...read more
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Q2. What are object and class in OOPs?
Ans. 
Objects are instances of classes in OOPs. Classes are blueprints for creating objects with attributes and methods.
• Objects are instances of classes

• Classes are blueprints for creating objects

• Classes define attributes and methods for objects

• Example: Class 'Car' with attributes like 'color' and methods like 'drive'
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I was asked to implement lru cache which i did but still didn’t made to next round as apparently i didn’t complete the working code though in my opinion i did