How To Get Rid Of Editor’s Error For Object.key

I have the following code that basically gets some JSON data, looks for the keys with 'servergenre', and saves the results in an array. This is a follow up of this question. let r

Solution 1:

ES2015, formerly known as ES6, is a more recent version of JavaScript, which introduces features such as the => syntax for functions you are using.

Not all features of ES2015 are fully supported in all browsers, so many people who use it pass it through a compiler (“transpiler”) first to convert it to ES5, which is supported by all browsers. Babel is one such transpiler. But if you are only targeting newer browsers, that would explain why the => syntax is working for you.

You just need to change your editor settings to understand that syntax. Exactly how you do that depends on what text editor you are using. It could be that your editor's built-in JavaScript mode doesn't know how to read ES2015 syntax, and you need to either upgrade your editor or install a third-party plugin that provides an updated error-checker. Or it could be that your editor supports both ES5 and ES2015, and it thinks you are trying to write your project only in ES5. In this case you just need to go to the settings and tell your editor that you mean for this project to use ES2015 (or ES2016, which is currently the most recent version).

Solution 2:

Fat arrows are ES6 syntax. If that causes trouble, just write good old ES5 :

let result = [];
Object.keys(data).forEach( function(key) {
      if(/servergenre/.test(key)){
           result.push(data[key])
      }
});