FAQ: React Router - useHistory

This community-built FAQ covers the “useHistory” exercise from the lesson “React Router”.

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This exercise can be found in the following Codecademy content:

React Router
(Beta) Learn React Router

FAQs on the exercise useHistory

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Hi there, I don’t understand the difference between declarative and imperative here. Why is Redirect declarative and history.push() imperative?

did you ever get an answer for this??? I thought imperative was using routing while the other was using link???

I didn’t. I guess what you say makes sense?

It’s just contrasting the two different kinds of syntax - i.e. declarative is defined by setting properties on the Route element in markup, whereas the useHistory functionality is used directly from JS code.

Behavior defined declaratively:

<Route path='/categories'>
  <Categories />
</Route>
<Route path='/profile'>
  <Profile />
</Route>

Behavior defined imperatively:

  // Get the history object
  const history = useHistory();
  const goBack = () => {
    // imperatively redirect back
    history.goBack();
  }

  const goForward = () => {
    // imperatively redirect forward
    history.goForward();
  }

That makes sense, thank you!

I have a question about task 4.

https://www.codecademy.com/paths/front-end-engineer-career-path/tracks/fecp-22-react-part-ii/modules/wdcp-22-react-router/lessons/intermediate-react-react-router/exercises/usehistory

I’m supposed to use useHistory() so that when I sign up, I can get redirected to the profile page. It works correctly but just wondering that in most cases, people who are on sing-up page have never visited the profile page, and thus I thought it’s impossible to go to the profile page by using useHistory(). In my understanding, useHistory() checks user’s browser’s history so it cannot be used to direct to the new page.

As far as I understand it, calling the .push() method on the history object is adding the specified location to top of the history stack, then navigating to the location on the top of the history stack.

So it isn’t dependent on if the user has accessed the URL already.

Hope that helps :slight_smile:

Feel free to correct me if I’ve got something incorrect :+1: