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JavaScript
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Type checking in JavaScript: typeof and instanceof operators

How to perform type checking in JavaScript using typeof and instanceof operators.
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3 Ways to Check if a Variable is Defined in JavaScript

How to check if a variable is defined in JavaScript using typeof operator, try/catch blocks, or window.hasOwnProperty().
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React Forms Tutorial: Access Input Values, Validate, Submit Forms

Posted November 10, 2020
A step by step tutorial on how to access input values, validate, and submit forms in React.
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Prototypal Inheritance in JavaScript

The guide on prototypal inheritance in JavaScript: prototype object, inherited propertes, chain of prototypes.
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How to Timeout a fetch() Request

Updated March 20, 2023
How to use setTimeout(), the abort controller, and fetch() API to make requests with a configurable timeout.
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How to Learn JavaScript If You're a Beginner

In this post I share my experience on how to learn JavaScript efficiently and stay motivated in the process.
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A Simple Explanation of React.useEffect()

Updated January 28, 2023
useEffect() hook executes side-effects in React components.
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A Simple Explanation of JavaScript Iterators

What are iterators and iterables in JavaScript and how to use them to iterate collections.
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How to Use React Controlled Inputs

Updated May 26, 2023
How to implement controlled inputs using hooks in React.
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Everything about null in JavaScript

Posted September 22, 2020
null in JavaScript is a special value that represents a missing object.
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