Core React#70 · Questions adapted from sudheerj/reactjs-interview-questions (MIT)

How to add Google Analytics for React Router?

Add a listener on the history object to record each page view:

history.listen(function (location) {
  window.ga("set", "page", location.pathname + location.search);
  window.ga("send", "pageview", location.pathname + location.search);
});

Code Lab

Every sample from this answer, open in the IDE. Edit it, run it, break it.

Drill it instead → Twelve graded reps on the three traps interviewers follow up on: state as a snapshot, effect cleanup, and keys as identity.

Example1.jsxjavascript4 linesreference

These samples are reference snippets — the IDE opens them for editing, without a preview.

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