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
| -e git://github.com/kennethreitz/inbox.py.git@551b4f44b144564504c687cebdb4c543cb8e9adf#egg=inbox | |
| alembic==0.8.3 | |
| amqp==1.4.9 | |
| anyjson==0.3.3 | |
| boto==2.39.0 | |
| braintree==3.20.0 | |
| cairosvg==1.0.19 | |
| celery==3.1.20 |
by Bjørn Friese
Beautiful is better than ugly. Explicit is better than implicit.
I frequently deal with collections of things in the programs I write. Collections of droids, jedis, planets, lightsabers, starfighters, etc. When programming in Python, these collections of things are usually represented as lists, sets and dictionaries. Oftentimes, what I want to do with collections is to transform them in various ways. Comprehensions is a powerful syntax for doing just that. I use them extensively, and it's one of the things that keep me coming back to Python. Let me show you a few examples of the incredible usefulness of comprehensions.
| { | |
| "presets": [ | |
| "@babel/preset-env", | |
| ] | |
| } |
| import React from 'react'; | |
| import styled from '@emotion/styled'; | |
| import { css } from '@emotion/core'; | |
| import { CSSTransition } from 'react-transition-group'; | |
| const has = (key, obj) => Object.prototype.hasOwnProperty.call(obj, key); | |
| const keyframes = [ | |
| 'appear', | |
| 'enter', |