Arrow function in es6

es6_arrow_function.js

// 1. single line without return
function foo () {
  console.log("Hello")
 }

const foo = () => console.log("Hello")

// 2. single line with return
function foo () {
   return "Hello"
}

const foo = () => "Hello"
console.log(foo())

// 3. Multiple line without return
function foo () {
  let a = 2
  let b = 3
  console.log(a + b)
}

const foo = () => {
  let a = 2
  let b = 3
  console.log(a + b)
}

// 4. Multiple line with return
const foo = () => {
  let a = 2
  let b = 3
  return a + b
}

// 5. Single line and pass args with return
const foo = a => a + 5 // return a + 5
const foo = (a,b) => a + b // return a + b