JavaScript in Action
https://developer.mozilla.org/en-US/docs/Web/JavaScript
Two versions of weather app in JavaScript ES5 and JavaScript ES6
ES6 IMPORTANT NOTES:
let person = {
firstname: 'John',
lastname: 'Doe',
greet: function() {
return 'Hello, '+ this.firstname+' '+ this.lastname;
},
greet2: () => 'Hello, '+ this.firstname+ ' ' +this.lastname
}
let firstname = 'Jane';
var lastname = 'Smith';
console.log(person.greet()); // Hello John Doe
console.log(person.greet2());// Hello Undefined Smith