Learn ECMAScript - Second Edition

Arrow functions

An arrow function is, at first glance, just a fancy way to create regular JavaScript functions (however, there are some surprises). Using arrow functions, you can create concise one-liner functions that actually work!

The following example demonstrates how to create an arrow function:

let circumference = (pi, r) => {  let ans = 2 * pi * r;  return ans;}let result = circumference(3.141592, 3);console.log(result); // Outputs 18.849552

Here, circumference is a variable, referencing to the anonymous arrow function. The previous code is similar to the following code in ES5:

var circumference = function(pi, r) {  var area = 2 * pi * r;  return area;}var result = circumference(3.141592, 3);console.log(result); //Output 18.849552

If your ...