Arrow function

 In Arrow function don't need name our functions.

    const myFunc = function () {
            const myVar = "shreyash";
            return myVar;
        }

arrow function

const myFunc = () => {
            const myVar = "shreyash";
            return myVar;
        }

Write Arrow function with parameters

just like a regular function you pass arguments into an arrow function 

const newFun = (a) => console.log(a);

If there is only one parameter in the arrow function, the brackets connecting the parameters can be omitted.

const newFun = a => console.log(a);

Set Default Parameters for your functions

        const profile= (name = "shreyash") => "Hello " + name;
        console.log(profile("pappu"));
        console.log(profile());

Hello pappu
Hello shreyash

Use Rest Parameter with function parameters

    ES6 provides rest parameter for function parameter to help us create more flexible functions. you can create function that take a variable number of arguments. These arguments are stored in an array that can be accessed later rom inside the function.

        function howMany(...args) {
            return "You have passed " + args.length + " arguments.";
        }
        console.log(howMany(0, 1, 2));
        console.log(howMany("string", null, [1, 2, 3], {}));

You have passed 3 arguments.
You have passed 4 arguments.