How to properly deal with this in classes?

Question

JavaScript

There is this class:

class ParserRSS {
    constructor(FeedParser, request) {
        this.feedParser = new FeedParser();
    }

    request(url) {
        const req = this.request(url);
        req.on('response', function(res) {
            this.pipe(this.feedParser);
        });
    }
}

Question in line: this.pipe(this.feedParser);. There, the first this from the callback should be, and the second should be a property of the class (which is set when the constructor is called). How can I make it clear to the code where this is?

Answer 1

Both this in this case is the context of the .on callback

Answer 2

https://learn.javascript.ru/bind
https://habrahabr.ru/post/149516/