What does "=>" mean in javascript when used with export default? [duplicate]

Question

I am analyzing some angular js source code of angular-file-upload plugin and I have some problems trying to understand some code.

I know that export is part of the new ES6 standards and it used to export functions and objects from a given file (or module).

But the following syntax is a bit weird me :

let {
    copy,
    extend,
    forEach,
    isObject,
    isNumber,
    isDefined,
    isArray,
    element
    } = angular;


    export default (fileUploaderOptions, $rootScope, $http, $window, 
                      FileLikeObject, FileItem) => {


        let {
            File,
            FormData
            } = $window;


        class FileUploader { 

          // class implemention.... 
        }

        return FileUploader;
    }

What is the use of the => operator in this statement?

Answer 1

This is an arrow function (or fat arrow function):

(a, b, c) => { /* ... */ }

Is (almost) equivalent to:

function(a, b, c) { /* ... */ }

The only difference between arrow functions and functions declared with function is that this has lexical binding in arrow functions instead of the confused morass of binding in regular functions.