why arrow functions in es code example

Example 1: js anonymous function es6

// (param1, param2, paramN) => expression

// ES5
var multiplyES5 = function(x, y) {
  return x * y;
};

// ES6
const multiplyES6 = (x, y) => { return x * y };

Example 2: how to make javascript function consise

multiplyfunc = (a, b) => { return a * b; }