How should I handle prefer arrow callback and unnamed function code issues

Question

I am new to ES6 and been trying to figure out how to rewrite this.

I am receiving the ff: in my eslint

• Unexpected function expression. (prefer-arrow-callback)
• Unexpected unnamed function. (func-names)

server.listen(config.site.port, config.site.host, function (err) { if (err) { throw err; } });

I tried reading the specs and try it out but can't seem to figure out what to do if it has if condition. https://eslint.org/docs/rules/prefer-arrow-callback

Thanks a lot.

Answer 1

The prefer-arrow-callback should be fixed by:

server.listen(config.site.port, config.site.host, (err) => {
   if (err) {
       throw err;
   }
});