es6_examples.js

//////
//
// ES6 Object.assign ...or... The correct way to set settings, from defaults and options.
//
let defaults = {
  a: 1,
  b: 2,
  c: 3
};

let options = {
  b: 55
};

let settings = Object.assign({}, defaults, options);

console.log(settings);

//////
//
// ES6  for...of loop
//
users = ['Son House', 'Skip James', 'R.L. Burnside', 'Mississippi John Hurt'];
for(let user of users) {
  console.log(user);
}


//////
//
// ES6 find
//
let recentTopics = [
  { 
    title: "Semi-colons: Good or Bad?",
    isLocked: true 
  },
  { 
    title: "New JavaScript Framework Released", 
    isLocked: true 
  },
  { 
    title: "ES2015 - The Shape of JavaScript to Come", 
    isLocked: false 
  }
];

let topic = recentTopics.find( (topic) => !topic.isLocked ); 
console.log(topic);


//////
//
// ES6  map data type
//
let user1 = { name: "Skip James" };
let user2 = { name: "Mississippi John Hurt" };
let mapSettings = new Map();

mapSettings.set(user1, 5);
mapSettings.set(user2, 42);

console.log(mapSettings);
console.log(mapSettings.get(user1));

//////
//
// ES6  container with unqiue values with set
//
let tags = new Set();

tags.add("Mississippi John Hurt");     // 1
tags.add("Skip James");                // 2
tags.add("Doc Watson");                // 3
tags.add("Richard Smith");             // 4   
tags.add("Jerry Reed");                // 5
tags.add("Jerry Reed");                // 6 - shouldn't add as not unique

console.log("Total items", tags.size); // => 5