Spynest Solutions Front end Developer Interview Questions and Answers

Q1. What is reactjs?
Ans. 
ReactJS is a JavaScript library for building user interfaces.
• ReactJS is developed and maintained by Facebook.

• It allows developers to create reusable UI components.

• ReactJS uses a virtual DOM for better performance.

• It follows a component-based architecture.

• ReactJS can be used to build single-page applications.
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Q2. What is call, apply and bind in javascript?
Ans. 
call, apply, and bind are methods in JavaScript used to manipulate the context of a function.
• call() is used to invoke a function with a specified 'this' value and arguments provided individually.

• apply() is similar to call() but arguments are passed as an array.

• bind() is used to create a new function with a specified 'this' value and initial arguments.
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Q3. Data Types in javascript
Ans. 
JavaScript has several data types including string, number, boolean, object, array, null, and undefined.
• String: 'hello'

• Number: 42

• Boolean: true or false

• Object: { key: value }

• Array: [1, 2, 3]

• Null: null

• Undefined: undefined
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2 DSA questions. Both medium level difficult

Coding test was the first round of interview

Q1. What is virtual dom in react and what makes it faster ?
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Q1. It was HR round
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Q1. What is Currying
Ans. 
Currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of nested functions, each taking a single argument.
• Currying helps in creating reusable functions and partial application.

• It allows for easier composition of functions.

• Example: const add = (a) => (b) => a + b; add(2)(3) will return 5.
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Q2. What are closures
Ans. 
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
• Closures allow functions to access variables from their outer function even after the outer function has finished executing.

• They help in maintaining state in functional programming.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }

• Example...read more
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Q3. What hooks you are familiar with
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Q1. What is reactjs?
Ans. 
ReactJS is a JavaScript library for building user interfaces.
• ReactJS is developed and maintained by Facebook.

• It allows developers to create reusable UI components.

• ReactJS uses a virtual DOM for better performance.

• It follows a component-based architecture.

• ReactJS can be used to build single-page applications.
Answered by AI
Add your answer
Q2. What is call, apply and bind in javascript?
Ans. 
call, apply, and bind are methods in JavaScript used to manipulate the context of a function.
• call() is used to invoke a function with a specified 'this' value and arguments provided individually.

• apply() is similar to call() but arguments are passed as an array.

• bind() is used to create a new function with a specified 'this' value and initial arguments.
Answered by AI
Add your answer
Q3. Data Types in javascript
Ans. 
JavaScript has several data types including string, number, boolean, object, array, null, and undefined.
• String: 'hello'

• Number: 42

• Boolean: true or false

• Object: { key: value }

• Array: [1, 2, 3]

• Null: null

• Undefined: undefined
Answered by AI
Add your answer

2 DSA questions. Both medium level difficult

Skill verifying by department oriented questions.

Q1. About technical related
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Q2. Query about technical knowledge.
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Q1. Self introduction and mindset of candidate related questions
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