Learning Redux

Handling EDIT_POST – editing posts

Next, we will handle the EDIT_POST action type:

1. We start by parsing the action object:

case EDIT_POST: {  const { type, id, ...newPost } = action

This time, we will pull out the type and id properties, because we will need the id later, and it should not be part of the post object.

We use the Array.prototype.map() function to return a new state array. If you do not know this function, it has the following signature:

const newArr = arr.map(  (elem, index) => { ... })

As you can see, map() accepts a callback function. The map function executes the callback function on each element and creates a new array from the return values of that callback function. Basically, map lets us apply a function to all elements ...