Tag: javascript
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Most referenced — #javascript
Intersection Observer API 3Memory Leaks — Closures, Detached DOM 3Touch Events & Pointer Events 3async / await in JavaScript 3ES6 Class Syntax 2Functional Array Methods (JS) 2ReferenceError — Undefined Variables 2Accidental Object Mutation Bugs 2
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Temporal Dead Zone (TDZ) ES2015
let and const variables exist in a Temporal Dead Zone from the start of their block until their declaration — accessing them before throws ReferenceError.
2mo ago
javascript intermediate
Type Coercion Gotchas (== vs ===) ES5
JavaScript's == performs type coercion producing surprising results — '0' == false (true), [] == false (true), null == undefined (true) — use === always.
2mo ago
javascript intermediate
TypeError — Common Causes and Fixes ES5
TypeError is thrown when a value is not of the expected type — most commonly 'Cannot read properties of undefined/null', the most frequent JavaScript runtime error.
2mo ago
javascript beginner
typeof Checks and the null Quirk ES5
typeof returns a string describing the type — but typeof null === 'object' is a famous historical bug that cannot be fixed without breaking the web, requiring explicit null checks alongside typeof.
2mo ago
javascript beginner
undefined vs null — Subtle Differences ES5
undefined means 'not yet assigned' (declared but empty); null means 'intentionally absent' — they're different values but both falsy, and typeof null === 'object' is a famous JS bug.
2mo ago
javascript beginner
Unhandled Promise Rejection ES2015
An unhandled Promise rejection occurs when a rejected Promise has no .catch() or try/catch handler — Node.js 15+ terminates the process on unhandled rejection by default.
2mo ago
javascript intermediate
AbortController — Cancellable Fetch ES2017
AbortController cancels in-flight fetch requests — essential for search-as-you-type, tab switching, and preventing race conditions in PHP API calls.
2mo ago
javascript intermediate
AJAX Patterns for PHP Backends ES2017
Patterns for communicating with PHP backends via fetch — JSON APIs, CSRF tokens, error handling, and response parsing.
2mo ago
javascript intermediate
Axios — HTTP Client for PHP APIs ES2015
Axios is a promise-based HTTP client with interceptors, automatic JSON parsing, and CSRF token injection — common in Laravel and Symfony frontends.
2mo ago
javascript intermediate
Client-Side Sanitisation ES2015
DOMPurify and the Sanitizer API remove dangerous HTML before insertion — complementing PHP's server-side htmlspecialchars for rich-text scenarios.
2mo ago
javascript intermediate
CSRF Token Handling in Fetch & Axios ES2017
Including PHP-generated CSRF tokens in JavaScript requests — reading from meta tags or cookies and attaching to every state-changing request.
2mo ago
javascript intermediate
DOM Manipulation ES5
querySelector, createElement, innerHTML — reading and modifying PHP-rendered HTML from JavaScript.
2mo ago
javascript beginner
ES6 Class Syntax ES2015
ES6 classes are syntactic sugar over prototypal inheritance — the keywords mirror PHP but the underlying mechanism is different.
2mo ago
javascript intermediate
File API — FileReader & File Input ES2015
File and FileReader provide client-side access to user-selected files before upload to PHP — enabling preview, validation, and chunked upload.
2mo ago
javascript intermediate
FormData API ES2015
FormData constructs key-value pairs from HTML forms for AJAX submission to PHP backends — supports file uploads without page reload.
2mo ago
javascript intermediate
Global Error Handling in JavaScript ES2017
window.onerror and unhandledrejection catch uncaught errors globally — essential for logging client-side errors back to PHP for monitoring.
2mo ago
javascript intermediate
History API — SPA Routing with PHP Backend HTML5
history.pushState and popstate enable URL changes without page reload — used for SPA routing while keeping PHP as the backend.
2mo ago
javascript intermediate
IndexedDB ES2015
Browser-native NoSQL database for offline-capable PHP web apps — stores structured data that survives page reloads, complements service workers.
2mo ago
javascript advanced
JavaScript Bundling — Vite, Webpack, esbuild ES2015
Bundlers combine JS modules into optimised files served by PHP — Vite for dev speed, Webpack for complex pipelines, esbuild for raw performance.
2mo ago
javascript intermediate
JSON.parse & JSON.stringify ES5
JSON.stringify converts JS objects to JSON strings; JSON.parse converts them back — direct counterpart to PHP's json_encode/json_decode.
2mo ago
javascript beginner