rajikaimal

const httpFetcher = require('http-fetcher');
const ghURI = '/users/:username/followers'; 

module.exports = function(username) {
	const URI = ghURI.replace(':username', username);

	return httpFetcher('api.github.com', URI, { 'User-Agent': 'github-followers' }, 'https');
}

rajikaimal

interface PorscheModel {
    engine: string;
    tyreModel: string;
    gears: number;
}

class PorscheCar implements PorscheModel {
    engine: string;
    tyreModel: string;
    gears: number;

rajikaimal

class PorscheCar {  
  constructor(params) {
    this.engine = params.engine;
    this.tyreModel = params.tyreModel;
    this.gears = params.gears;
  }
}

class PorscheCarFactory {  
  createCar(params) {

rajikaimal

function porscheCar(params) {
  this.engine = params.engine;
  this.tyreModel = params.tyreModel;
  this.gears = params.gears;
}

function porscheCarFactory() {
  this.createCar = function(params) {
    return new porscheCar(params);
  }

rajikaimal

function iter(num) {
  if(num > 5) return;

  setImmediate(() => {
    console.log('SetImmediate');
  });

  process.nextTick(() => { 
    console.log(`NextTick, iteration ${num}`);
    iter(num + 1);

rajikaimal

setTimeout(() => {
  console.log('SetTimeout callback');
}, 0);

setImmediate(() => {
  console.log('SetImmediate callback');
});

// Output:
// SetImmediate callback

rajikaimal

const fs = require("fs");

fs.readFile(__filename, () => {
  setTimeout(() => {
    console.log('SetTimeout callback');
  }, 0);
  setImmediate(() => {
    console.log('SetImmediate callback');
  });
});

rajikaimal

const fs = require('fs');

fs.readFile(__filename, () => {
  setImmediate(() => {
    console.log('SetImmediate callback');
  });
  
  process.nextTick(() => { console.log('NextTick callback') })
});

rajikaimal

const fs = require('fs');

fs.readFile(__filename, () => {
  setTimeout(() => {
    console.log('SetTimeout callback');
  }, 0);
  setImmediate(() => {
    console.log('SetImmediate callback');
  });

rajikaimal

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?