Essential JavaScript Concepts You MUST Know Before Learning React

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Basic Concepts:

Variables
Loops
Normal Functions
Handling Events
Default Imports
Named Imports
Scopes
Array Methods
String Methods

Intermediate Concepts:

Arrow Functions
Function Expressions
Spread Operators
Destructuring
Callbacks
Map
Filter
Reduce

Advanced Concepts:

Asynchronous JS
Promises
Async/Await
Lexical Scoping
Working with Objects

🚀 #JavaScript #React #WebDevelopment #Learning

A hands-on JavaScript experience
JSchallenger provides a variety of JavaScript exercises, including coding tasks, coding challenges, lessons, and quizzes
https://jschallenger.com/ #javascript

Reactjs Interview Questions

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Just Screen Recorded a JavaScript Method for you guys. Hope you learn something from this.
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Reply you answer.
#ArrayMethods
#Javascript

⚡️parseInt()
and
⚡️Number()

both converts string to number however there is a big difference between both

⚡️ parseInt() reads the string from left to right & stops parsing when it encounters a non-numeric character.

It returns the numeric value parsed up to that point.

example: parseInt("19abc") -> returns 19

⚡️Number() is more strict.

If the string contains any non-numeric characters (except for whitespace), it returns NaN

example: Number(123abc) -> returns NaN

⚡️Also if string is in float then Number() will return float number but parseInt() will only return integer.

example:
parseInt("6.9") -> returns 6 only
Number("18.5") -> returns 18.5

This makes a big impact especially when you are handling data that can have string values as well attached to the number.

In that case use parseInt() other wise use Number().

@javascript_resources #javascript

In JavaScript, when you add numbers together, they add up. But if you mix in a string, it gets stuck to the end. So, 3 + 4 + '5' becomes '75'. Cool, right? 🤓 #JavaScript #Programming

👨💻 20 React Interview Questions: From Basics to Advanced 2025

Prepare for your React interviews with this curated questions. From understanding the fundamentals of React and SPA architecture to diving deep into advanced concepts like Context API, HOCs, and React Portals, this resource has got you covered.



✨ Categories Covered:

1. Freshers' Questions: React basics, JSX, components, props vs. state, and more.

2. Intermediate Topics: Virtual DOM, lifecycle methods, hooks, and props drilling.

3. Advanced Concepts: Context API, reconciliation, React Router, and strict mode.

🧑‍💻 Whether you're a beginner or leveling up your expertise, these questions will sharpen your React skills for your next big interview!

#ReactJS #WebDevelopment #ReactInterviewQuestions #FrontendDevelopment #JavaScript #TechInterviews #LearnReact #Programming #CodingInterviews #ReactHooks #WebDesign #FrontendCareer

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