Comparing Arrays in JavaScript
Comparing arrays in JavaScript is trickier than it first looks. This guide covers reference equality, value comparison, and practical alternatives.
Articles
JavaScript, page 17 of 18
JavaScript is the working language behind most of my front‑end writing, from small browser behaviours to application state and asynchronous code. These articles favour the mechanism behind a feature over a clever trick, whether the subject is callbacks, async code, or a language edge that only becomes obvious in production.
Comparing Arrays in JavaScript. 
Writing Safer JavaScript for Older Browsers. Writing Safer JavaScript for Older Browsers
Write safer JavaScript for older browsers by checking support, avoiding fragile assumptions, containing failures, and keeping core interactions usable.
Immediately Invoked Function Expressions (Iifes). Immediately Invoked Function Expressions (Iifes)
IIFEs were a common JavaScript pattern before modern modules took over. This guide explains what they do, why they existed, and when they still appear.
Understanding call, apply, and bind in JavaScript. Understanding
call,apply, andbindin JavaScriptUnderstand call, apply, and bind in JavaScript, including this context, borrowed methods, callbacks, partial application, and production review caveats.
Appending and Prepending Items to JavaScript Arrays. Appending and Prepending Items to JavaScript Arrays
Use push() and unshift() to append or prepend JavaScript array items, with simple examples and the easily missed return value of each method.
How Inheritance Works in the JavaScript Prototype Chain. How Inheritance Works in the JavaScript Prototype Chain
The JavaScript prototype chain underpins inheritance, enabling object property sharing. Here, I explore its workings, property searching, and quirks.
JavaScript Build Tools and Module Formats. JavaScript Build Tools and Module Formats
A practical overview of JavaScript build tools and module formats, covering globals, CommonJS, AMD, Browserify, bundling, and project trade‑offs.
Type Coercion in JavaScript: Implicit vs. Explicit Conversion. Type Coercion in JavaScript: Implicit vs. Explicit Conversion
Type coercion in JavaScript explained clearly, including implicit vs. explicit conversion, equality surprises, string concatenation, and number casting.
Using CommonJS to Implement Modules in JavaScript. Using CommonJS to Implement Modules in JavaScript
Use CommonJS modules in JavaScript with require() and module.exports, covering Node.js origins, browser bundling, limitations, and ES module comparison.
Controlled vs. Uncontrolled Components in React. Controlled vs. Uncontrolled Components in React
Controlled vs. uncontrolled components in React explained with form examples, refs, validation trade‑offs, and why each approach suits different jobs.
Why this Changes in JavaScript Event Handlers and Methods. Why
thisChanges in JavaScript Event Handlers and MethodsUnderstand why this changes in JavaScript methods and event handlers, including call sites, arrow functions, bind(), event objects, and context bugs.
Looping in JavaScript ES5 and ES6: forEach and for...of. Looping in JavaScript ES5 and ES6:
forEachandfor...ofCompare classic for loops, ES5 forEach() and ES6 for...of in JavaScript, including NodeList support, readability and when a loop can stop early.
Asynchronous Module Definition (AMD) in JavaScript. Asynchronous Module Definition (AMD) in JavaScript
Asynchronous Module Definition explained, including AMD module loading, define(), dependency handling, CommonJS, ES modules, and modern relevance.
Keeping jQuery Plugins Maintainable. Keeping jQuery Plugins Maintainable
Keep jQuery plugin usage maintainable with clear wrappers, option defaults, event names, lifecycle checks, CSS boundaries, ownership, and update notes.
Getting Started with Callbacks in JavaScript. Getting Started with Callbacks in JavaScript
Callbacks are a core part of JavaScript, even if promises get more attention now. This guide explains how they work and where they still show up.
Primitive vs. Reference Types in JavaScript. Primitive vs. Reference Types in JavaScript
Primitive vs. reference types in JavaScript explained clearly, including copying behaviour, mutation, equality, and why arrays and objects surprise beginners.
Lifting State up in React. Lifting State up in React
Lifting state up in React explained clearly, including shared state, single sources of truth, child callbacks, and when moving state higher helps.
Check If Your Site is Running on localhost. Check If Your Site is Running on
localhostThere are many reasons that you might want to detect whether your code is running on localhost. Aside from using environment variables, there's also JavaScript!
