FAQ: React Router - useHistory

Frequently Asked Questions Uncategorized
1

Community%20FAQs%20on%20Codecademy%20Exercises
Community%20FAQs%20on%20Codecademy%20Exercises1000×208 141 KB

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

Paths and Courses
This exercise can be found in the following Codecademy content:

React Router
(Beta) Learn React Router

FAQs on the exercise useHistory

There are currently no frequently asked questions associated with this exercise – that’s where you come in! You can contribute to this section by offering your own questions, answers, or clarifications on this exercise. Ask or answer a question by clicking reply (reply) below.

If you’ve had an “aha” moment about the concepts, formatting, syntax, or anything else with this exercise, consider sharing those insights! Teaching others and answering their questions is one of the best ways to learn and stay sharp.

Join the Discussion. Help a fellow learner on their journey.

Ask or answer a question about this exercise by clicking reply (reply) below!
You can also find further discussion and get answers to your questions over in Language Help.

Agree with a comment or answer? Like (like) to up-vote the contribution!

Need broader help or resources? Head to Language Help and Tips and Resources. If you are wanting feedback or inspiration for a project, check out Projects.

Looking for motivation to keep learning? Join our wider discussions in Community

Learn more about how to use this guide.

Found a bug? Report it online, or post in Bug Reporting

Have a question about your account or billing? Reach out to our customer support team!

None of the above? Find out where to ask other questions here!

2

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

3

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

4

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

5

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();
  }
6

That makes sense, thank you!

7

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.

8

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: