FAQ: Redux Middleware - Introduction to Thunks

Frequently Asked Questions React.js FAQ
1

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This community-built FAQ covers the “Introduction to Thunks” exercise from the lesson “Redux Middleware”.

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This exercise can be found in the following Codecademy content:

Learn Redux

FAQs on the exercise Introduction to Thunks

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2

Are the two code snippets the same? If not same can you explain to me?

1)

const remindMeTo = task => {

  return `Remember to ${task}!!!`

}

console.log(remindMeTo('call mom'))

const remindMeLater = task => {

  return () => {

    return remindMeTo(task);

  }

}

const reminder = remindMeLater('buy vegetable now');

console.log(reminder());

2)

const remindMeTo = task => {

  return `Remember to ${task}!!!`

}

console.log(remindMeTo('call mom'))

const remindMeLater = task => {

  return () => {

    return remindMeTo(task);

  }

}

const reminder = remindMeLater('buy vegetable now');

reminder();
1 Like
3

What exactly is happening when we use thunks?
I really don’t understand what I am suppose to learn in this exercise.

2 Likes
4

In the first one your logging reminder to the console and in the second, you’re not.

5

In the second one you are calling reminder but you are not logging what it returns to the console so you are doing nothing with the result of calling it (the “Remember to buy vegetable now !!!” string).

6

You’re basically just creating a function that doesn’t return the result immediately after calling it.

For example if we had the following :

reminder = remindMeTo(‘be cool’)

That means that in the variable reminder we now store a string (Remember to be cool !!!) since the return of remindMeTo(‘be cool’) gives us that string. And if we wanna see it we can console.log(reminder).

But if we have,

reminder = remindMeLater(‘be cool’)

The variable reminder now stores a function. Because remindMeLater(‘be cool’) returns a function, and only after we call it, that function returns the string. So if we wanna see the string, we have to call it inside the console.log(reminder());

7

its just a function that returns a function to be called at a later time.

8

you can also do const remindMeLater = task => () => remindMeTo(task);