Основы ES6

const obj = { foo: 1 }; 

obj.bar = 2;

const speed = 'quick'; `The ${speed} brown fox jumps over the lazy dog.`

let name = 'Harry';

let occupation = 'wizard';

console.log(`Hi! My name is ${name}. I'm a ${occupation}.`);

const PI = 3.14; 

console.log(PI) // Печатает 3.14

let some_text = "some string"; 

if(some_text.indexOf('str') !=-1){

 return true;

 }

let titleElements = document.querySelectorAll('.article .title'); let titles = Array.from(titleElements).map( t => t.textContent ); console.log(titles);

let point = [1,3], segment = [point,[5,5]], triangle = [...segment,[1,8]]; 

class Slave { // ... };

 const slave = Slave();