Maintec Technologies Frontend Developer Intern Interview Questions and Answers

Q1. Basic Javascript questions were asked like Hoisting, Event Loop, Closure.
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Q2. What are semantic tags? << HTML based question
Ans. 
Semantic tags in HTML are specific tags that provide meaning to the content they enclose.
• Semantic tags help search engines and screen readers understand the structure of a webpage.

• Examples of semantic tags include <header>, <footer>, <nav>, <article>, <section>, <aside>, <main>, <figure>, <figcaption>.

• Using semantic tags improves SEO and accessibility of a website.
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Q3. What is currying in js?
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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 you to create new functions by fixing some parameters of an existing function.

• Example: const add = (a) => (b) => a + b; add(2)(3) will return 5.
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Q4. What is the difference between Map and Filter?
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Map is used to transform each element of an array, while Filter is used to select elements based on a condition.
• Map returns a new array with the same length as the original array, but with each element transformed based on a provided function.

• Filter returns a new array with only the elements that pass a provided condition function.

• Example for Map: [1, 2, 3].map(num => num * 2) will result in [2, 4, 6].

• Example for Fi...read more
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Q5. What is the difference between Map and ForEach?
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Map creates a new array with the results of calling a provided function on every element, while forEach executes a provided function once for each array element.
• Map returns a new array with the same length as the original array, while forEach does not return anything.

• Map does not mutate the original array, while forEach can mutate the original array.

• Map is more suitable for transforming data and creating a new array, w...read more
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Q6. What is the difference between Authentication and Authorization?
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Authentication verifies the identity of a user, while authorization determines the user's access rights.
• Authentication confirms the user's identity through credentials like username and password.

• Authorization determines what actions the authenticated user is allowed to perform.

• Authentication precedes authorization in the security process.

• Example: Logging into a website (authentication) and then accessing specific pages
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Q7. What is the difference between Local storage and Session storage?
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Local storage persists even after the browser is closed, while session storage is cleared when the browser is closed.
• Local storage has no expiration date, while session storage expires when the browser is closed.

• Local storage stores data with no limit, while session storage has a limit of around 5MB.

• Local storage data is available across all windows/tabs for that domain, while session storage data is only available wit...read more
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Q1. This was the Final round, it lasted for around 30 mins and the interviewer gave me a coding question to build a Countdown Timer app.
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Q1. React QA and javascript QA
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Even after answering all the questions correctly along with coding done with exact expected output you will get rejected becoz they are fake job interview or eye wash campaign it’s better to avoid.

Q1. Angular basic, JS basic
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Q2. Some output questions and DSA problems.
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Q1. All basic and advance concept questions on javascript.
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Q2. React hooks and scenario based questions.
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Reactive form with 2 fields and closure function Array function

2 problems, coding problems, java script

Q1. React version, redux middleware
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Q1. What is difference between useState, useContext and redux
Ans. 
useState is for managing state within a component, useContext is for sharing state between components, and redux is for managing global state across the application.
• useState is a React hook used to manage state within a functional component

• useContext is a React hook used to share state between components without prop drilling

• Redux is a state management library that allows for managing global state across the applicatio...read more
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Q2. What is the difference between== and ===
Ans. 
The difference between == and === in JavaScript
• == is the equality operator in JavaScript, which performs type coercion before comparing two values

• === is the strict equality operator, which does not perform type coercion and compares both value and type

• Using === is generally considered safer and more predictable than using ==

• Example: 1 == '1' will return true, but 1 === '1' will return false
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Q1. What is call and apply in JS
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call and apply are methods in JS used to invoke a function with a specified 'this' value and arguments.
• call() method is used to invoke a function with a specified 'this' value and arguments provided individually

• apply() method is used to invoke a function with a specified 'this' value and arguments provided as an array

• Both methods are used to borrow methods from other objects, and to set the 'this' value explicitly
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