hemanth

I have marked with a * those which I think are absolutely essential Items for each section are sorted by oldest to newest. Come back soon for more!

BASH

• In bash, 'ctrl-r' searches your command history as you type

• Add "set -o vi" in your ~/.bashrc to make use the vi keybindings instead of the Emacs ones. Takes some time to get used to, but it's fantastic!
• Input from the commandline as if it were a file by replacing 'command < file.in' with 'command <<< "some input text"'
• '^' is a sed-like operator to replace chars from last command

madrobby

sudo apt-get update
sudo apt-get install libfreetype6 libfreetype6-dev libfontconfig 

# /etc/apt/sources.list should contain these:
# deb http://us.archive.ubuntu.com/ubuntu/ lucid multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ lucid multiverse
# deb http://us.archive.ubuntu.com/ubuntu/ lucid-updates multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ lucid-updates multiverse

sudo echo ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true | sudo debconf-set-selections

mraleph

$ cat test.js
function foo () { while (true) { } }
function bar () { return foo(); }
bar();
$ node test.js &
$ gdb attach $(pidof node)
0x00000bf778c63d5f in ?? ()
(gdb) b v8::internal::Runtime_StackGuard
Breakpoint 1 at 0x84a1f0
(gdb) print 'v8::V8::TerminateExecution'(0)

iainmcgin

(function() {
  // request PerformanceResourceTiming info for all resources on the page
  var resources = window.performance.getEntriesByType('resource');

  // filter all resources to just +1 button iframes with timing information
  var p1Resources = resources.filter(function(rtInfo) {
    return rtInfo.name.indexOf('_/+1/fastbutton') != -1 &&
           rtInfo.responseStart != 0;
  });

trevnorris

The prep-script.sh will setup the latest Node and install the latest perf version on your Linux box.

When you want to generate the flame graph, run the following (folder locations taken from install script):

sudo sysctl kernel.kptr_restrict=0
# May also have to do the following:
# (additional reading http://unix.stackexchange.com/questions/14227/do-i-need-root-admin-permissions-to-run-userspace-perf-tool-perf-events-ar )
sudo sysctl kernel.perf_event_paranoid=0

igrigorik

Navigation and Resource Timing provides timing data for the fetch, but currently there is no interoperable way for the server to communicate own timing information to the client. For example:

• What steps were taken to generate the resource, and how long each took. Many sites already embed this type of information via HTML comments - e.g. wordpress emits <!--Page generated in X.X seconds.--> , and many sites provide more detailed stats (cache, db, generation) to enable performance debugging.
• If proxied, where was the time spent - e.g. time to fetch from origin, time to process response, etc.

Instead of relying on arbitrary HTML comments, we can define an HTTP header that can be used to send key-value pairs in a well defined format. Making this data available via a well defined interface would...

• Allow UA and other developer tools to automatically annotate appropriate timelines.
• Allow analytics vendors to gather this data for operational analysis.
• Allows proxies and CDNs to append custom timing d

domenic

Embedders of V8 should generally use the head of the branch corresponding to the minor version of V8 that ships in Chrome.

Finding the minor version of V8 corresponding to the latest stable Chrome

To find out what version this is,

1. Go to https://omahaproxy.appspot.com/
2. Find the latest stable Chrome version in the table
3. Enter it into the "Translate a Chrome verison to a V8 version" box below the table.
4. Ignore the last two parts.

WebReflection

update

I've created a little repository that simply exposes the final utility as npm module.

It's called html-escaper

---

there is basically one rule only: do not ever replace one char after another if you are transforming a string into another.

wincent

2015-01-29 Unofficial Relay FAQ

Compilation of questions and answers about Relay from React.js Conf.

Disclaimer: I work on Relay at Facebook. Relay is a complex system on which we're iterating aggressively. I'll do my best here to provide accurate, useful answers, but the details are subject to change. I may also be wrong. Feedback and additional questions are welcome.

What is Relay?

Relay is a new framework from Facebook that provides data-fetching functionality for React applications. It was announced at React.js Conf (January 2015).

rvagg

#!/bin/bash

# Note your /usr/local will need to be writable by the user running it,
# alternatively run it with `sudo`

hasxz=$(which xzcat)
os=$(uname | tr '[A-Z]' '[a-z]')
arch=$(uname -m)
targetdir="/usr/local/"
domain=nodejs.org