Arrow functions in JavaScript

Since their introduction arrow function have simplified how we declare functions in JavaScript arrow functions are similar to lambadas in kotlin programming language
Instead of writing a function as

function time (param){
    return Date.now()
}

You can simplify code by rewriting it as simply

let time (param) =>  {
    return Date.now()
}

Alternatively you can use a neatier syntax

let time = param => Date.now()

Arrow functions this context does not refer to their scope.

For further reading "learn es6 the dope way part ii arrow functions and the this keyword",

https://medium.com/@__Masha__/learn-es6-the-dope-way-part-ii-arrow-functions-and-the-this-keyword-381ac7a32881