Check history previous location before goBack() react router v4

Question

My goal is to enable a \"Go Back\" button, but only if the route/path the user would go back to is in a certain category.

More precisely I have two kinds of Routes

Answer 1

The history object has entries and the current index. I used these in the following way:

var lastLocation = history.entries[history.index - 1];
var lastUrl = lastLocation.pathname;