All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.
Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.
elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
I fell in love with CoffeeScript a couple of years ago. Javascript has always seemed something of an interesting curiosity to me and I was happy to see the meteoric rise of Node.js, but coming from a background of Python I really preferred a cleaner syntax.
In any fast moving community it is inevitable that things will change, and so today we see a big shift toward ES6, the new version of Javascript. It incorporates a handful of the nicer features from CoffeeScript and is usable today through tools like Babel. Here are some of my thoughts and issues on moving away from CoffeeScript in favor of ES6.
While reading I suggest keeping open a tab to Babel's learning ES6 page. The examples there are great.
Holy punctuation, Batman! Say goodbye to your whitespace and hello to parenthesis, curly braces, and semicolons again. Even with the advanced ES6 syntax you'll find yourself writing a lot more punctuatio
| // Promise.all is good for executing many promises at once | |
| Promise.all([ | |
| promise1, | |
| promise2 | |
| ]); | |
| // Promise.resolve is good for wrapping synchronous code | |
| Promise.resolve().then(function () { | |
| if (somethingIsNotRight()) { | |
| throw new Error("I will be rejected asynchronously!"); |
| /* bling.js */ | |
| window.$ = document.querySelector.bind(document); | |
| window.$$ = document.querySelectorAll.bind(document); | |
| Node.prototype.on = window.on = function(name, fn) { this.addEventListener(name, fn); }; | |
| NodeList.prototype.__proto__ = Array.prototype; | |
| NodeList.prototype.on = function(name, fn) { this.forEach((elem) => elem.on(name, fn)); }; |
| 'use strict'; | |
| module.exports = function CustomError(message, extra) { | |
| Error.captureStackTrace(this, this.constructor); | |
| this.name = this.constructor.name; | |
| this.message = message; | |
| this.extra = extra; | |
| }; | |
| require('util').inherits(module.exports, Error); |
The basic structure of a React+Flux application (see other examples)
- /src/actions/AppActions.js - Action creators (Flux)
- /src/components/Application.js - The top-level React component
- /src/constants/ActionTypes.js - Action types (Flux)
- /src/core/Dispatcher.js - Dispatcher (Flux)
- /src/stores/AppStore.js - The main store (Flux)
| // --- Variables | |
| // --------------------------------------------------- | |
| // grid | |
| $gutter: 10; | |
| $max-width: 1100; // Max grid wrap width | |
| $sm-column-count: 4; | |
| $med-column-count: 6; | |
| $lg-column-count: 12; | |
| $mqs: 380; // small breakpoint |
| DELETE FROM sales_flat_quote WHERE (updated_at < DATE_SUB(NOW(),INTERVAL 60 DAY) || is_active = 0) |
| # General web stuff | |
| /.htaccess | |
| /robots.txt | |
| /sitemap.xml | |
| /*.sql | |
| /google*.html | |
| # Magento stuff | |
| app/etc/local.xml | |
| downloader/.cache |