`this` in callback points to wrong object

Question

I have this viewModel:

import app = require(\"durandal/app\");
import appViewModel = require(\"appViewModel\");
import dataService = require(\"dataService\");

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Answer 1

Since you are passing the function to someone else to call in .then(this.activateView); you need to preserve the context yourself, best if you do : .then((view)=>this.activateView(view));

More about this : https://www.youtube.com/watch?v=tvocUcbCupA