paulirish

What forces layout / reflow

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.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

50kudos

#!/bin/bash

cat $(find app/assets/stylesheets/ -type f) |
grep -Eo '\.[a-z]+[a-z0-9_-]*' | sort | uniq | sed s/.// |

while read CSS; do
  if ! grep -Erqi "([^(remove|has)]?class[(:|=|[:space:]*=>[:space:]*)]*[[:space:]\W]*[(\"|')]*[-a-z0-9[:space:]]*$CSS|\\.$CSS\b)" app/views/ vendor/assets/ app/assets/javascripts/; then
    echo $CSS >> unused.scss;
  fi
done

oakes

Contents

• Why care about Rust?
• The Toolchain
• Creating a New Project
• Modules
• Crates
• Types
• References
• Mutability

qiaohaijun

## GistList: TODO for coders

mahiuchun

swift() {
  local swift_=/Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift
  if [[ -z $@ ]]
  then
    $swift_
  else
    $swift_ -i $@
  fi
}

bitemyapp

The Learning Haskell guide has been moved to a git repo to enable outside contribution

Find it here: https://github.com/bitemyapp/learnhaskell

wolever

# prompt examples:
#   [3 jobs master virtualenv] ~/code/myproject/foo
#   [1 job my-branch virtualenv] ~/code/bar/
#   [virtualenv] ~/code/
#   ~
# Very, very fast, only requiring a couple of fork()s (and no forking at all to determine the current git branch)

if [[ "$USER" == "root" ]]
then
    export PS1="\e[1;31m\]\u \[\e[1;33m\]\w\[\e[0m\] ";

7hunderbird

ruby-1.9.3-p484 cumulative performance patch for rbenv

This installs a patched ruby 1.9.3-p484 with the railsexpress patchsets: https://github.com/skaes/rvm-patchsets

Requirements

• rbenv
• ruby-build

You will also need a C Compiler. If you're on Linux, you probably already have one or know how to install one. On OS X, you should install XCode, and brew install autoconf using homebrew.

dergachev

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

stephencelis

#!/usr/bin/env sh
#
# Works best with blinking text: the last heart will blink when you have less
# than 25% of your battery life remaining.
#
# Add the following to your `~/.tmux.conf`;
#
#     set -g status-right "#[fg=red]#(path/to/zelda-battery-tmux.sh) "

battery="$(pmset -g ps | awk 'NR==2' | perl -pe 's/.*?(\d+)%.*/\1/')"