berzniz

// Boring
if (isThisAwesome) {
  alert('yes'); // it's not
}

// Awesome
isThisAwesome && alert('yes');

// Also cool for guarding your code
var aCoolFunction = undefined;

getify

In defense of blocks for local scopes (Part 2)

Some have leveled the criticism that "part 1" of this post is unnecessarily contriving a problem that doesn't really exist in "good code" -- if you really need to narrow a scope of some declarations in a function, then that function is too complex already and that bigger problem is what you need to fix.

Just to be extra clear: if a chunk of code is already reasonable to make a function, that's not the sort of code I'm talking about in either of these blog posts. If it's being called multiple times, or if it's completely independent and makes sense as its own logical chunk, make it a function. I'm talking about a different sort of code, a set of a few statements related to each other, that declare one or more variables, but which logically still belong inside another function. That's the context here.

OK, let's stop talking about this stuff abstractly.

A Real Example

rauschma

This content moved here: https://exploringjs.com/impatient-js/ch_arrays.html#quickref-arrays

joshj

/* 
    Node.js, express, oauth example using Twitters API
    
    Install Node.js:
        curl -0 http://nodejs.org/dist/v0.6.11/node-v0.6.11.tar.gz
        tar -zxf node-v0.6.11.tar.gz
        cd node-v0.6.11
        ./configure
        make
        make install

felipekm

import boto3

# defines ec2
ec2 = boto3.resource('ec2')

# lambda handler
def lambda_handler(event, context):

  # builds an array filter to get EC2 instances with TAG `LIGAR`
  arrOffInstancesFilter = [

jcemer

This is a proposal for a lightning talk at the Reactive 2016 conference. If you like this, star the Gist.

---

Thinking metrics on React applications

In regular websites, it is common to send multiple events to track user clicks. Single Page Applications change the way you look at metrics. This is a talk about a simple pattern we created at Globo.com to manage a metrics layer for http://globoplay.globo.com. The talk will cover how to track user flow using Google Analytics and other services. We solved the challenge of tying metrics and components, keeping information across pages and having global data. Also some React, React Router and React Side Effects concepts like context, higher order components, history state will be covered.

jsanta

#!/bin/bash

memtotal=$(free | grep Mem | awk '{ print $2 }')
memuse=$(free | grep Mem | awk '{ print $3 }')
let "memusepercent = $memuse * 100 / $memtotal "
let "memtolerance = $memtotal * 0.9 "
echo "MemTotal: $memtotal (Usage tolerance: $memtolerance )"
echo "MemUsed: $memuse ($memusepercent %)"
if [ $memuse -ge $memtolerance ]; then
    echo "Memory use over 90%"

obolton

AWS ELB with Node.js and WebSockets

This assumes that:

• You are using Nginx.
• You want to accept incoming connections on port 80.
• Your Node.js app is listening on port 3000.
• You want to be able to connect to your Node.js instance directly as well as via the load balancer.

####1. Create load balancer

zenorocha

// Future versions of Hyper may add additional config options,
// which will not automatically be merged into this file.
// See https://hyper.is#cfg for all currently supported options.

module.exports = {
  config: {
    // default font size in pixels for all tabs
    fontSize: 14,

    // font family with optional fallbacks

bashtoni

aws acm us-east-1 list-certificates --query CertificateSummaryList[].[CertificateArn,DomainName] \
  --output text | grep example.com | cut -f1