Dmitri Pavlutin

I help developers understand JavaScript and React

All posts Search About

All posts

October 2021

Covariance and Contravariance in TypeScript

October 14, 2021

What are Higher-Order Functions in JavaScript?

javascript function

October 7, 2021

September 2021

How to Use TypeScript with React Components

typescript react

September 29, 2021

Index Signatures in TypeScript

typescript object

September 22, 2021

An Easy Guide to React useReducer() Hook

react usereducer hook

September 15, 2021

unknown vs any in TypeScript

typescript unknown any

September 8, 2021

A Guide to React Context and useContext() Hook

react context hook

September 2, 2021

August 2021

How to Use Promise.any()

javascript promise async

August 26, 2021

2 Ways to Remove a Property from an Object in JavaScript

javascript object property

August 17, 2021

'return await promise' vs 'return promise' in JavaScript

javascript promise async

August 10, 2021

How to Use Promise.allSettled()

javascript promise async

August 3, 2021

July 2021

How to Use fetch() with JSON

July 28, 2021

JavaScript Promises: then(f,f) vs then(f).catch(f)

javascript promise

July 21, 2021

What is a Promise in JavaScript?

javascript promise

July 15, 2021

How to Use Promise.all()

javascript promise async

July 6, 2021

A Simple Guide to Component Props in React

July 2, 2021

June 2021

Don't Stop Me Now: How to Use React useTransition() hook

react usetransition hook

June 23, 2021

A Simple Explanation of JavaScript Variables: const, let, var

javascript variable const let var

June 16, 2021

How to Dynamically Import ECMAScript Modules

javascript module

June 10, 2021

How to Memoize with React.useMemo()

react usememo hook

June 4, 2021

May 2021

How to Cleanup Async Effects in React

May 25, 2021

Why Math.max() Without Arguments Returns -Infinity

javascript number

May 18, 2021

How to Correctly Debounce and Throttle Callbacks in React

May 11, 2021

Don't Confuse Function Expressions and Function Declarations in JavaScript

javascript function

May 4, 2021

April 2021

How to Use ECMAScript Modules in Node.js

javascript module nodejs

April 27, 2021

Solving a Mystery Behavior of parseInt() in JavaScript

javascript number

April 20, 2021

How to Use Array Reduce Method in JavaScript

javascript array reduce

April 13, 2021

3 Ways to Merge Arrays in JavaScript

javascript array

April 6, 2021

March 2021

A Guide to Jotai: the Minimalist React State Management Library

react state open source

March 30, 2021

The Difference Between Values and References in JavaScript

javascript object

March 23, 2021

How to Implement a Queue in JavaScript

javascript computer science data structure queue

March 16, 2021

A Helpful Algorithm to Determine "this" value in JavaScript

javascript this function

March 9, 2021

The Complete Guide to useRef() and Refs in React

react useref hook dom element

March 2, 2021

February 2021

7 Interview Questions on "this" keyword in JavaScript. Can You Answer Them?

javascript this interview

February 23, 2021

How to Greatly Enhance fetch() with the Decorator Pattern

fetch decorator pattern async await

February 16, 2021

7 Interview Questions on JavaScript Closures. Can You Answer Them?

javascript closure interview

February 9, 2021

What's a Method in JavaScript?

javascript function method

February 2, 2021

January 2021

array.sort() Does Not Simply Sort Numbers in JavaScript

javascript array number sort

January 26, 2021

How to Solve the Infinite Loop of React.useEffect()

react hook useeffect

January 19, 2021

The New Array Method You'll Enjoy: array.at(index)

javascript array

January 12, 2021

What's the Difference between DOM Node and Element?

dom node element

January 5, 2021

December 2020

Why Promises Are Faster Than setTimeout()?

javascript promise event loop

December 29, 2020

Everything About Callback Functions in JavaScript

javascript function

December 22, 2020

How React Updates State

react hook usestate

December 15, 2020

5 Mistakes to Avoid When Using React Hooks

react hook useeffect usestate

December 8, 2020

5 Best Practices to Write Quality JavaScript Variables

javascript variable clean code

December 1, 2020

November 2020

Type checking in JavaScript: typeof and instanceof operators

javascript typeof instanceof

November 24, 2020

3 Ways to Check if a Variable is Defined in JavaScript

javascript variable undefined

November 17, 2020

React Forms Tutorial: Access Input Values, Validate, Submit Forms

react form input

November 10, 2020

What Makes JavaScript JavaScript? Prototypal Inheritance

javascript prototype inheritance

November 3, 2020

October 2020

How to Timeout a fetch() Request

October 27, 2020

How to Learn JavaScript If You're a Beginner

javascript craftsmanship

October 20, 2020

A Simple Explanation of React.useEffect()

react hook useeffect

October 13, 2020

A Simple Explanation of JavaScript Iterators

javascript iterable iterator array

October 6, 2020

September 2020

React Controlled Components, the Hooks Way

react component input form hook

September 29, 2020

Everything about null in JavaScript

javascript null object

September 22, 2020

How to Use Fetch with async/await

fetch async await

September 15, 2020

Getting Started with Arrow Functions in JavaScript

javascript arrow function function

September 8, 2020

An Interesting Explanation of async/await in JavaScript

javascript async await

September 1, 2020

August 2020

Front-end Architecture: Stable and Volatile Dependencies

architecture clean code dependency

August 25, 2020

Is it Safe to Compare JavaScript Strings?

javascript equality string

August 18, 2020

How to Access Object's Keys, Values, and Entries in JavaScript

javascript object

August 11, 2020

What Actually is a String in JavaScript?

javascript string

August 4, 2020

July 2020

3 Ways to Shallow Clone Objects in JavaScript (w/ bonuses)

javascript object

July 28, 2020

Checking if an Array Contains a Value in JavaScript

javascript array

July 21, 2020

A Simple Explanation of Event Delegation in JavaScript

javascript event delegation

July 14, 2020

How to Parse URL in JavaScript: hostname, pathname, query, hash

url hostname pathname query string hash

July 7, 2020

June 2020

3 Ways to Detect an Array in JavaScript

javascript array

June 30, 2020

How to Get the Screen, Window, and Web Page Sizes in JavaScript

June 23, 2020

3 Ways to Check If an Object Has a Property in JavaScript

javascript object property

June 16, 2020

How to Compare Objects in JavaScript

javascript equality object

June 8, 2020

May 2020

Object.is() vs Strict Equality Operator in JavaScript

javascript equality

May 31, 2020

Own and Inherited Properties in JavaScript

javascript prototype inheritance object

May 24, 2020

5 Differences Between Arrow and Regular Functions

javascript function arrow function

May 16, 2020

How to Use Object Destructuring in JavaScript

javascript destructuring

May 10, 2020

Your Guide to React.useCallback()

react memoization

May 4, 2020

April 2020

5 JavaScript Scope Gotchas

javascript scope variable

April 26, 2020

A Simple Explanation of Scope in JavaScript

javascript scope variable

April 20, 2020

How && and || Operators Really Work in JavaScript

April 9, 2020

The Module Import in JavaScript Has a Drawback

javascript es2015 module

April 1, 2020

March 2020

Why for...of Loop in JavaScript is a Gem

March 25, 2020

Handy Tips on Using console.log()

javascript debugging

March 18, 2020

What Happens When a Module Is Imported Twice?

javascript es2015 module

March 10, 2020

3 Rules of React State Management

javascript react state

March 4, 2020

February 2020

4 Best Practices to Write Quality JavaScript Modules

javascript module clean code

February 26, 2020

4 Ways to Swap Variables in JavaScript

javascript variable

February 19, 2020

How To Setup Your Local React Playground

February 11, 2020

3 Ways To Access Object Properties in JavaScript

javascript object property destructuring

February 5, 2020

January 2020

5 Best Practices to Write Quality Arrow Functions

javascript arrow function clean code

January 29, 2020

String Interpolation in JavaScript

javascript string es2015

January 22, 2020

The Explicit Coding Discipline

craftsmanship clean code

January 15, 2020

NaN in JavaScript

javascript number

January 8, 2020

How To Use Correctly JavaScript Utility Libraries

javascript module

January 2, 2020

December 2019

3 Ways To Replace All String Occurrences in JavaScript

javascript string

December 24, 2019

Infinity in JavaScript

javascript number

December 17, 2019

The Complete Guide to JavaScript Classes

javascript class instanceof

December 11, 2019

Type Checking in JavaScript is Slightly Screwed

javascript typeof instanceof

December 3, 2019

November 2019

The Benefits of Orthogonal React Components

react component architecture

November 27, 2019

15 Common Operations on Arrays in JavaScript (Cheatsheet)

javascript array

November 20, 2019

The Wise Guide to React useState() Hook

react state hook

November 13, 2019

Lifecycle methods, hooks, suspense: which's best for fetching in React?

react lifecycle hook suspense

November 6, 2019

October 2019

A Simple Explanation of JavaScript Closures

javascript closure scope

October 25, 2019

Be Aware of Stale Closures when Using React Hooks

October 24, 2019

7 Simple but Tricky JavaScript Interview Questions

javascript closure array hoisting interview

October 15, 2019

When to Use Map instead of Plain JavaScript Object

javascript map object

October 9, 2019

Don't Use JavaScript Variables Without Knowing Temporal Dead Zone

javascript variable tdz es2015

October 1, 2019

September 2019

How to Solve Render Props Callback Hell

react render prop

September 24, 2019

Let's Master JavaScript Function Parameters

javascript function parameter

September 17, 2019

How to Handle Easily 'this' in JavaScript

javascript this

September 11, 2019

How To Accelerate the JavaScript Spread Operator

javascript spread performance

September 3, 2019

August 2019

5 Handy Applications of JavaScript Array.from()

javascript array es2015

August 27, 2019

How to Use JavaScript Optional Chaining

javascript optional chaining nullish coalescing

August 21, 2019

5 Interesting Uses of JavaScript Destructuring

javascript destructuring rest es2015

August 15, 2019

How to Make Your Open Source Project Successful

August 6, 2019

July 2019

Arrow Functions Shortening Recipes in JavaScript

javascript arrow function es2015

July 30, 2019

How to Become a Better Software Developer by Digging & Climbing

craftsmanship clean code architecture

July 23, 2019

Use React.memo() wisely

react memoization

July 17, 2019

5 JavaScript Bad Coding Habits to Unlearn Right Now

javascript undefined clean code craftsmanship

July 10, 2019

How to Use forEach() to Iterate an Array in JavaScript

javascript array foreach

July 3, 2019

January 2018

An Easy Guide to Object Rest/Spread Properties in JavaScript

javascript spread rest

January 3, 2018

September 2017

7 Architectural Attributes of a Reliable React Component

react component architecture

September 26, 2017

April 2017

7 Tips to Handle undefined in JavaScript

javascript undefined

April 15, 2017

December 2016

Announcing Voca: The Ultimate JavaScript String Library

javascript string open source

December 14, 2016

November 2016

Make Your Swift Code Expressive: Addition Operator Use Cases

November 16, 2016

How to Use Correctly 'self' Keyword in Swift

November 9, 2016

Mastering Swift: Tips About Array and Dictionary Literals

swift array set

November 1, 2016

October 2016

Useful Details About Underscore Keyword in Swift

swift underscore

October 25, 2016

Coding like Shakespeare: Practical Function Naming Conventions

October 12, 2016

Mastering Swift: Essential Details About Strings

swift string unicode

October 5, 2016

September 2016

Useful Tips for Migrating to Swift 3.0

September 28, 2016

The Path of Software Development Craftsmanship

javascript craftsmanship

September 21, 2016

What every JavaScript developer should know about Unicode

javascript string unicode

September 14, 2016

August 2016

The Art of Writing Small and Plain Functions

javascript function clean code

August 31, 2016

How to Iterate Easily Over Object Properties in JavaScript

javascript object

August 23, 2016

Make your JavaScript Code Shine: Knockout Old ES5 Hacks (Part 2)

javascript es2015

August 17, 2016

Make your JavaScript Code Shine: Knockout Old ES5 Hacks

javascript es2015

August 10, 2016

Detailed Overview of Well-known Symbols

javascript symbol es2015

August 3, 2016

July 2016

JavaScript Variables Lifecycle: Why let Is Not Hoisted

javascript variable hoisting

July 27, 2016

Why Object Literals in JavaScript Are Cool

javascript object es2015

July 20, 2016

Must Know Details about ES2016 Features

javascript es2016

July 12, 2016

Yes. JavaScript Rises.

July 4, 2016

June 2016

Power Up the Array Creation in JavaScript

javascript array

June 28, 2016

6 Ways to Declare JavaScript Functions

javascript function

June 22, 2016

How Three Dots Changed JavaScript

javascript spread rest iterable iterator

June 14, 2016

When 'Not' to Use Arrow Functions

javascript arrow function function

June 6, 2016

May 2016

JavaScript Variables Hoisting in Details

javascript variable hoisting es2015

May 30, 2016

Gentle Explanation of "this" in JavaScript

javascript this

May 22, 2016

Inheritance in JavaScript: Understanding the constructor Property

javascript constructor instanceof

May 1, 2016

January 2016

Catch the XMLHttpRequest in Plain JavaScript

January 24, 2016

The Magic Behind Array Length Property

javascript array

January 17, 2016

The Legend of JavaScript Equality Operator

javascript equality

January 4, 2016

JavaScript Addition Operator in Details

javascript addition

January 2, 2016

August 2015

Install Node Like a Boss with nvm

August 29, 2015