jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

khalidx

The experience of using Node.JS with TypeScript, ts-node, and ESM is horrible.

There are countless guides of how to integrate them, but none of them seem to work.

Here's what worked for me.

Just add the following files and run npm run dev. You'll be good to go!

package.json

StephanHoyer

'use strict';

var Octokat = require('octokat');
var extend = require('lodash/object/assign');

var defaults = {
  branchName: 'master',
  token: '',
  username: '',
  reponame: ''

rstacruz

Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

radutzan

Nuevo: SCLTransit

Ignacio Hermosilla implementó un servicio web de acceso público usando los feeds GTFS de Transantiago y los puntos de acceso oficiales que normalmente requieren acuerdos con el DTPM, para que tú no tengas que hacerlo.

Está toda la información de Transantiago que puedas necesitar, con formatos de alta calidad y sin trámites. Estas APIs son las que ahora alimentan a Cromi.

Revisa los endpoints y la documentación en scltrans.it

APIs internas de Transantiago (no recomendadas)

Transantiago implementó estas APIs para uso interno, por lo que no hay ninguna garantía sobre su funcionalidad, mantenimiento o futura existencia. Úsalas bajo tu propio riesgo. (Probablemente no es aconsejable que las uses para nada crítico.)

rauchg

Minimum Viable Async with Node 6

With the release of Node 6.0.0, the surface of code that needs transpilation to use ES6 features has been reduced very dramatically.

This is what my current workflow looks like to set up a minimalistic and fast microservice using micro and async + await.

The promise

Miserlou

zappa invoke --raw 'import subprocess; print subprocess.check_output("ls");'

nutanc

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.auth.oauth2.TokenResponse;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeRequestUrl;
import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.googleapis.auth.oauth2.GoogleTokenResponse;
import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestFactory;
import com.google.api.client.http.HttpTransport;

princejwesley

const repl = require('repl');
const babel = require('babel-core');

function preprocess(input) {
  const awaitMatcher = /^(?:\s*(?:(?:let|var|const)\s)?\s*([^=]+)=\s*|^\s*)(await\s[\s\S]*)/;
  const asyncWrapper = (code, binder) => {
    let assign = binder ? `global.${binder} = ` : '';
    return `(function(){ async function _wrap() { return ${assign}${code} } return _wrap();})()`;
  };