How I built a property price guessing game that got 32.7k unique visitors in the first 48 hours

How I built and launched PropertyGuessr

What is Automatic Semicolon Insertion (ASI) and what are the rules that govern it?

Automatic Semicolon Insertion in JavaScript

Parsing, validating and manipulating dates in JavaScript with Day.js

Getting started with Day.js

Build a simple Pomodoro timer extension in 25 minutes

Create your first chrome extension

Authentication in your react native apps made easy

Authentication in expo react native with okta

Learn how to use Array.prototype.findIndex() to locate elements in an array

How to find the index of an element in JavaScript

Learn how to use Array.prototype.slice() to split an array into even chunks

How to split an array into chunks in JavaScript

Learn how to get the minimum and maximum values of elements in an array in JavaScript

How to get the min and max of an array in JavaScript

Learn how to get the union of two arrays by combining Set and the spread operator

How to merge two arrays into a unique array in JavaScript

Learn how to use Array.every() to check if all elements in array meet a condition

How to check if all values in an array meet a condition in JavaScript

Learn how to use Array.isArray(value) to check if a value is an array

How to determine if a value is an array in JavaScript

Learn how to use Array.join() to generate string from an array

How to combine an array into a string in JavaScript

Learn how to split a string into an array of substrings

How to split a string in JavaScript

Learn how and when to use the Nullish Coalescing Operator ??

Nullish Coalescing in Javascript

Learn how to call async functions from map()

How to call an async function with Array.prototype.map

Using setTimeout and setInterval to control the execution of code at specified time intervals

Introduction to JavaScript scheduling

Comparing two arrays without the need for utility libraries

How to compare two arrays in JavaScript

Swapping array elements without needing a temporary variable

How to swap two array elements in JavaScript

Randomizing the order of elements in an array using the modern version of the Fisher-Yates shuffle

The correct way to shuffle an array in JavaScript

Getting to grips with the max and min aggregate functions in SQL

Max and Min in SQL

Using the AVG aggregate function in SQL to get average of the values of a column

How to get the average of a column in SQL

Dot notation versus brackets, which is preferable and why?

JavaScript property access

Using the SUM aggregate function in SQL to sum the values of a column

How to sum a column in SQL

Get a number that represents a point in time by the number of ms that have passed since the Unix Epoch

How to get a timestamp in JavaScript

Using String.prototype.includes or String.prototype.indexOf to check if a substring exists

How to check if a string contains a substring in JavaScript

Learn how to use regular expressions to validate an email address

How to validate an email address in JavaScript

Redirecting to pages programmatically using window.location

How to redirect to another page using JavaScript

Removing duplicates for a JavaScript array with ES6 Set

How to get all unique values in a JavaScript array

What convention should be used when naming databases, tables, and fields?

Postgres naming conventions

Managing state in React functional components with hooks

React Hooks: useState

Consistent, easy and automatic code formatting for you and your team in minutes

Getting started with Prettier in VSCode

Loops explained: for loops, while loops, control flow

Loops in JavaScript

The difference between undefined and null in JavaScript

JavaScript undefined vs null

Learn how to use Array.prototype.reduce to group an array of objects by key

How to group an array of objects by key in JavaScript

Learn how to reverse a string in Javascript using the Array.prototype methods

How to reverse a string in JavaScript

Demystifying how the value of this is assigned in different contexts

Understanding the JavaScript this keyword

Generating custom error messages using throw

How to throw an exception in JavaScript

Getting to grips with one of the harder to understand Array.prototype methods

How to use reduce in JavaScript

Using typeof & instanceof methods to check the type of any variable

How to check the type of a variable in JavaScript

How to perform string interpolation using template literals

String interpolation in JavaScript

Getting to grips with the file at heart of many codebases in the JavaScript ecosystem

A guide to package.json

Getting to grips with the ECMAScript module system

Introduction to CommonJS modules

A brief look at what evaluates to false in JavaScript

What are Falsy values in JavaScript?

How to declare default function parameters in JavaScript

JavaScript default function parameters

Introduction to ES modules

Manage multiple installations of Node.js on Windows

Easily manage your Node.js version with nvm for Windows

Learn how to get a random sample of n elements from an array

How to get n elements randomly from an array in JavaScript

Learn how to get a random element from an array in JavaScript

How to get a random element from an array in JavaScript

Create a utility function to partition an array based on a condition in vanilla JS

How to partition an array based on a condition in JavaScript

Learn how to check if a value is in an array using includes()

How to check if a value is in an array in JavaScript

Generate an array of values that you can then manipulate with map, forEach etc

How to generate an array from 0 to N in JavaScript

Learn how to flatten an array in JavaScript

How to flatten an array in JavaScript

Learn how to combine two arrays into a new array

How to join two arrays in JavaScript

Learn how to reverse an array in Javascript using the Array.prototype method

How to reverse an array in JavaScript

Learn how to create a new object that combines two objects properties

How to merge two objects in JavaScript

The three methods of variable declaration in JavaScript

Fraser Hamilton

Full Stack Software Engineer

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