75 Essential Cheat Sheets for Designers and Programmers | DesignZum
75 Essential Cheat Sheets for Designers and Programmers -
John Cox
Blogs · @wyome
Tagged tutorial · everything
Understanding JavaScript’s ‘undefined’ | JavaScript, JavaScript...
JavaScript distinguishes between three separate concepts that all use the word "undefined": the Undefined type, the undefined value (which uninitialized variables and functions without return statements assume), and the undefined global variable property. A ReferenceError occurs when JavaScript tries to access an unresolvable reference—one whose base value cannot be found—which happens when you use an identifier that was never declared with var and isn't a property of an accessible object. To safely check for variables that might not exist (like `console` in older browsers), you can use property access on the global object rather than typeof checks, since accessing an undefined property won't throw an error as long as its base value exists.
Variables vs. Properties in JavaScript | JavaScript, JavaScript...
Variables and properties are distinct in JavaScript despite appearing interchangeable at the global scope: variables exist within execution contexts as part of a VariableObject, while properties belong to objects. The key differences emerge in non-global contexts, where a function's VariableObject (ActivationObject) cannot be directly accessed as an object, and in behavioral distinctions like hoisting (variables are hoisted but not their values, while property assignments are not hoisted), deletion (variables have [[DontDelete]] set to true by default, properties set to false), and naming (only properties can use illegal identifier names via bracket notation). Understanding this distinction is essential for predicting program behavior, particularly regarding scope, variable shadowing, and the effects of the `delete` operator.
Lesser-Known JavaScript Debugging Techniques
The post explains lesser-known browser debugging techniques beyond basic breakpoints and console logging, particularly useful for production apps with minified code. It covers built-in Command Line API functions like `debug()` and `monitor()` for tracking function calls, then introduces DebugUtils, a custom library that extends debugging capabilities to native methods, custom events, and property access by wrapping them with debugger statements. The library provides shortcuts like `$dum()` for native methods, `$duv()` for custom events, and `$dus()` for property changes, enabling developers to quickly identify what code is modifying objects or triggering events in complex systems.
Is jQuery Too Big For Mobile? | Flippin' Awesome
This guide ranks Canadian online casinos primarily on the structure and achievability of their welcome bonuses, comparing offers from operators like Cashed, SlotsGem, and WinnerIsland across wagering requirements, game eligibility, and payout caps rather than headline bonus figures alone. It explains how no deposit bonuses actually work in practice—covering wagering multiples, bet limits, withdrawal caps, and time windows—with worked examples showing why a large bonus isn't necessarily worth more than a modest one. The piece also covers payment methods available to Canadian players, provincial licensing differences, and responsible-gambling setup recommendations.
Your jQuery: Now With 67% Less Suck ◆ 24 ways
jQuery's ease of use can lead to poorly optimized code that degrades performance, particularly in older browsers like Internet Explorer. The piece identifies three major sources of inefficiency—slow selectors, excessive event listeners, and repeated DOM manipulation—and provides practical solutions: using faster selector methods (IDs and tag names over classes or pseudo-selectors) and caching them, delegating events to parent elements rather than binding listeners to individual children, and building DOM content in memory before inserting it into the page in a single operation. Small optimizations in these areas compound to create noticeably faster user experiences.
COLORGLARE | To close or not to close
# Summaries **Simple but Effective Skeleton Loaders** — Shows how to build placeholder loading states using only HTML and CSS, giving developers complete control over appearance without relying on external libraries. **The createSubscriber() Function** — Explains Svelte's createSubscriber() utility for handling reactive values from external data sources, detailing the problems it solves and when to apply it. **The $effect.root Rune** — Details Svelte 5's $effect.root feature, clarifying its purpose, proper usage patterns, lifecycle behavior, and when to reach for alternative approaches instead. **The $effect.tracking Rune** — Introduces Svelte 5's $effect.tracking rune for managing tracking contexts and explains the problems this addition was designed to solve. **Building an Interactive 3D Hero Animation** — Walks through creating and optimizing a WebGL particle effect using three.js as a starting point, then refactoring into a custom implementation with binary files and web workers for performance. **Labels** — Compares Swift's function parameter labels to TypeScript, showing how explicit naming and overloading in Swift produce more readable and flexible APIs. **Closures** — Examines Swift's closure syntax and capabilities alongside TypeScript equivalents, highlighting features like type inference, shorthand arguments, and trailing closures that enable concise code. **Introduction** — Introduces Swift as a language worth learning for web developers, covering its syntax advantages from variables through async patterns. **Get Full Type Support With Plain JavaScript** — Demonstrates how to leverage TypeScript's benefits while writing in vanilla JavaScript. **Accessible Hamburger Buttons without JavaScript** — Builds a semantic, keyboard-navigable menu toggle using only HTML and CSS. **CSS Resets and Global Styles in Web Components** — Addresses the CSS isolation challenges that arise when extracting components as reusable web components. **Svelte Components as Web Components** — Shows how to build an application in Svelte Kit while also packaging individual components as standalone web components for use elsewhere. **To Close or Not to Close** — Explores HTML's historical development to settle whether the `<br>` tag should include a self-closing slash.
Ratchet - PHP WebSockets
Ratchet is a PHP WebSocket library that enables real-time, event-driven communication applications as an alternative to traditional HTTP request/response patterns. It features a modular component architecture for building functionality incrementally, maintains PSR-4 compliance for compatibility with other PHP frameworks like Symfony, and passes all WebSocket browser compatibility tests.
scrollReveal.js
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10 jQuery Snippets Designers Should Know
10 #jQuery Snippets Designers Should Know -
A re-introduction to JavaScript (JS Tutorial) - JavaScript | MDN
This is a comprehensive guide to JavaScript's core language features covering data types (seven primitives plus objects), operators, control structures, and functions. It explains key concepts like JavaScript's dynamic typing, the distinction between `let`/`const`/`var`, how type coercion works with `==` versus `===`, and the fundamentals of objects and arrays as mutable collections. The piece also introduces advanced topics like closures, classes, asynchronous programming through callbacks/promises/async-await, and the module system, while clarifying the distinction between language-level features (like arithmetic) and runtime-level features (like `console.log()` or DOM access).
You Might Not Need jQuery
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User Timing API: Understanding your Web App - HTML5 Rocks
The User Timing API provides browser methods to measure application performance by inserting named marks at different points in JavaScript code and calculating elapsed time between them using the measure() function, allowing developers to identify performance bottlenecks without relying on imprecise millisecond-level timing. The API includes tools like mark() to record timestamps, measure() to calculate intervals, getEntriesByType() to retrieve timing data, and clearMarks() to reset measurements, with an example showing how to instrument XMLHttpRequests to track individual request durations.
4 HTTP Security headers you should always be using | ibuildings
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HTML5 Input Types Alternative
HTML5's new input types suffer from inconsistent browser implementation, making them unreliable for production use. The author created W2UI Fields, a lightweight jQuery-based library (18KB JS, 6KB CSS) that provides enhanced form controls including numeric inputs with keyboard shortcuts, date/time pickers with range and blocking options, dropdown lists and multi-select controls with filtering, and a file uploader that encodes files to base64 for AJAX submission. The library maintains consistent behavior across browsers and offers extensive configuration options for customizing validation, formatting, and styling of form inputs.
Line Menu Icon... That Is A Menu | CSS-Tricks
This post presents a clever UI technique where the hamburger menu icon itself is actually the full menu scaled down to icon size, then expanded when clicked. The implementation uses CSS transforms to shrink the entire menu to 0.1 scale by default, then toggles back to full size with a class change, while managing click interactions through pointer-events and adding a close button. The author also discusses progressive enhancement considerations—inserting the close button with JavaScript, using Modernizr to detect CSS transform support, and ensuring the menu remains accessible if styling fails.
45 Useful JavaScript Tips, Tricks and Best Practices | Flippin' Awesome
45 Useful #JavaScript Tips, Tricks and Best Practices -
The HTML5 Vibrate API | Shape Shed
The HTML5 Vibration API lets developers trigger device vibration through simple JavaScript commands, either as single vibrations or patterns of multiple vibrations and pauses specified in milliseconds. Browser support at the time of writing was limited to Chrome Beta and Firefox on Android, while iOS Safari and standard Chrome Android didn't support it. The article provides code examples for feature detection using vendor prefixes and demonstrates both basic usage and how to create vibration patterns using arrays.
5 .htaccess Snippets to Borrow from HTML5 Boilerplate
This article demonstrates practical .htaccess configurations from HTML5 Boilerplate that improve website security, performance, and functionality, including blocking hidden files, compressing files by MIME type, enabling cross-domain access for fonts and images via CORS, and setting browser cache expiration times for different file types. The author emphasizes that these server-side optimizations—particularly gzip compression and long cache expiration on static assets—provide significant performance benefits with minimal code overhead.
jQuery Label Better by Pete R. | The Pete Design
#jQuery Label Better -