Splash of ES6

little_es6.js

"use strict";

// Experimenting with ES6 on NodeJS
// node --harmony --harmony_default_parameters ./little_es6.js

var numbers = [1, 1, 2, 5, 3];
var littleSum = numbers.filter(x => x % 2).reduce((s, b) => s + b);
console.log(`Sum is ${littleSum}.`);

numbers.forEach(l => console.log(l));
for (let n of numbers.filter(x => x % 2 == 0)) console.log(n);

console.log(numbers.map((x) => {
  return x * x
}).join(", "));

var Something = class {
  constructor(pSex = 'm') {
    this.sex = pSex;
  }
};

var Person = class extends Something {
  constructor(first_name, last_name, sex) {
    super(sex);
    this.first_name = first_name;
    this.last_name = last_name;
    return this;
  }

  get firstName() {
    return this.first_name;
  }

  get lastName() {
    return this.last_name;
  }

  get fullName() {
    return `${this.firstName} ${this.lastName}`
  }

  toString() {
    return this.fullName + ", " + this.sex;
  }
};

let oto = new Person("Oto", "Brglez");
console.log(oto.toString());
console.log(oto.firstName);

let people = [new Person("Martina", "H.", "f"), new Person("Oto", "B."), new Person("Teja", "B.", "f")];
console.log(people.filter(p => p.sex == "f").sort((a, b)=> {
  if (a.last_name > b.last_name) return 1;
  if (a.last_name < b.last_name) return -1;
  return 0;
}));

const Source = class extends require('events').EventEmitter {};

var s = new Source;
s.on('init', (event) => {
  console.log(`Got ${event}`);
  s.emit('hello', "Oto");
});

s.on('hello', (event)=> {
  console.log(`Hello ${event}!`);
});

s.emit("init", "oto");

const sum = (a = 0, b = 0) => a + b;
console.log(sum(10) == 10);