EcmaScript | ES6 arrow_functions.js

// One line return
const increment1 = (number) => ++number
// or without parentheses
const increment2 = number => ++number
// Analog in ES5
var increment3 = function(number) {
  return ++number 
}
// One line return object
const returnObj1 = () => ({ a: 1, b: 2 })
// Analog in ES5
var returnObj2 = function() {
  return { a: 1, b: 2 }
}