arthurvi

Boolean() or !! (double bang, double negation)?

What's the best way to answer the question "true or false?" in JavaScript

JavaScript does not bother you too much with types (at first), which is both a blessing and a cure. But we all know the Boolean type. Boolean variables can either be true or false. Yes or no.

Every value in JavaScript can be translated into a boolean, true or false. Values that translate to true are truthy, values that translate to false are falsy. Simple.

This is about two ways to make that translation.

wangruohui

In this article, I will share some of my experience on installing NVIDIA driver and CUDA on Linux OS. Here I mainly use Ubuntu as example. Comments for CentOS/Fedora are also provided as much as I can.

Table of Contents

• Install NVIDIA Graphics Driver via apt-get
• Install NVIDIA Graphics Driver via runfile
  • Remove Previous Installations (Important)
  • Download the Driver
  • Install Dependencies
  • Creat Blacklist for Nouveau Driver

• Stop lightdm/gdm/kdm

jimbol

a = {b: 1, c:{ d:3 }}
z = Object.assign({}, a)
z.c.d = 4
console.log(a.c.d) // 4

christianalfoni

What is the difference between Cerebral and Redux?

Cerebral and Redux were built to solve different problems

Redux was developed to achieve hot reloading global state and state changing logic. To achieve that it was necessary for state changes to be run with pure functions and the state has to be immutable. Now you can change the logic inside your reducer and when the application reloads Redux will put it in its initial state and rerun all the actions again, now running with the new state changing logic.

Cerebral had no intention of achieving hot reloading. Cerebral was initially developed to give you insight into how your application changes its state, using a debugger. In the Redux debugger you see what actions are triggered and how your state looks after the action was handled. In Cerebral you see all actions fired as part of a signal. You see asynchronous behaviour, paths taken based on decisions made in your state changing flow. You see all inputs and outputs produced during the flow and you even

telekosmos

var uniqueArray = function(arrArg) {
  return arrArg.filter(function(elem, pos,arr) {
    return arr.indexOf(elem) == pos;
  });
};

var uniqEs6 = (arrArg) => {
  return arrArg.filter((elem, pos, arr) => {
    return arr.indexOf(elem) == pos;
  });

Vestride

Encoding Video

Installing

Install FFmpeg with homebrew. You'll need to install it with a couple flags for webm and the AAC audio codec.

brew install ffmpeg --with-libvpx --with-libvorbis --with-fdk-aac --with-opus

mrtns

# Install
# via http://askubuntu.com/questions/510056/how-to-install-google-chrome

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - 
sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
sudo apt-get update 
sudo apt-get install google-chrome-stable


# Update

rmehner

// Credit to @steobrien from https://gist.github.com/rmehner/b9a41d9f659c9b1c3340#gistcomment-2940034
// for modern browsers, this works:
const dbs = await window.indexedDB.databases()
dbs.forEach(db => { window.indexedDB.deleteDatabase(db.name) })

// for older browsers, have a look at previous revisions of this gist.

tungel

Installing Arch:


sudo vim /etc/pacman.conf
Update packages list: sudo pacman -Syy
run sudo pacman -Syu  before installing any software (to update the repositories first)

* Timing issue:
    - Change hardware clock to use UTC time:
        sudo timedatectl set-local-rtc 0