使用Hapi.js创建服务器

Question

I'm going through a tutorial on Hapi.js. In the code below,

// Start the server
server.start((err) => {

if (err) {
    throw err;
}
console.log('Server running at:', server.info.uri);
});

What is the syntax used in (err) => . Is it a function declaration? I can't find this operator in Javascript syntax anywhere. Appreciate any clarification. Thanks.

Answer 1

That is the arrow function expression. You can read about it here https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Functions/Arrow_functions