ianaya89

Keybase proof

I hereby claim:

• I am ianaya89 on github.
• I am ianaya89 (https://keybase.io/ianaya89) on keybase.
• I have a public key whose fingerprint is CC95 CEE3 B67B E98F 11FF 4493 E628 369C 5247 E538

To claim this, I am signing this object:

ianaya89

Blocking methods execute synchronously and non-blocking methods execute asynchronously.

Using the File System module as an example, this is a synchronous file read:

const fs = require('fs');
const data = fs.readFileSync('/file.md'); // blocks here until file is read
And here is an equivalent asynchronous example:

const fs = require('fs');
fs.readFile('/file.md', (err, data) => {

ianaya89

// let
if(true) {
  var a = 'a';
  let b = 'b';

  console.log(b + ' is available' );
}

console.log(a); // ✅
console.log(b); // ❌ => ReferenceError: b is not defined

ianaya89

const fakeTitles = [
    'Pirate Of Reality',
    'Guardians Of Hell',
    'Witches With Vigor',
    'Spies And Heroes',
    'Robots And Kings',
];

// Nueva Sintaxis
const abbreviations = fakeTitles.map(title => title.toLowerCase().slice(0, 3)); // ES6

ianaya89

// properties
const name = 'Ignacio';
const age = 27;

const person = { name, age }; // ES6
const person = { name: name, age: age }; //ES5

// methods
const dog = { 
  bark() {

ianaya89

// Object
const myObj = {a: 'a', b: 'b', c: 'c'};
const {a, c} = myObj;

console.log(a); // => a
console.log(c); // => c


// Array
const [d, m, a] = [21, 10, 2015]; 

ianaya89

// asignar parametros a funcion
function getVolume(width, height, depth) {
    return width * height * depth;
}

const values = [10, 20, 30];
console.log(getVolume(...values)); // => 6000

// concatenar arrays
const array1 = [1, 2, 3];

ianaya89

// variables
const foo = 'bar';
const bizz = 'bang';

console.log(`Foo is ${foo} and bizz is ${bizz}`); // => 'Foo is bar and bizz is bang'

// llamadas de funciones
function hello() {
  return 'hello';
}

ianaya89

function foo(x = 11, y = 31) {
    console.log( x + y );
}

foo();                  // 42
foo( 5, 6 );            // 11
foo( 0, 42 );           // 42

foo( 5 );               // 36

ianaya89

const map = new Map();
    
map.set('foo', 123);
map.get('foo') // 123
map.has('foo') // true

map.set(10, 'Something...');
map.get(10) // Something...
map.has(10) // true