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Ilya Kantor 2019-07-10 12:33:03 +03:00
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1-js/11-async/03-promise-chaining/article.md
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@ -146,7 +146,7 @@ Returning promises allows us to build chains of asynchronous actions.
## Example: loadScript
Let's use this feature with the promisified `loadScript`, defined in the [previous chapter](/promise-basics#loadscript), to load scripts one by one, in sequence:
Let's use this feature with the promisified `loadScript`, defined in the [previous chapter](info:promise-basics#loadscript), to load scripts one by one, in sequence:
```js run
loadScript("/article/promise-chaining/one.js")
@ -207,9 +207,7 @@ Sometimes it's ok to write `.then` directly, because the nested function has acc
````smart header="Thenables"
To be precise, `.then` may return an arbitrary "thenable" object, and it will be treated the same way as a promise.
A "thenable" object is any object with a method `.then`.
To be precise, `.then` may return a so-called "thenable" object - an arbitrary object that has method `.then`, and it will be treated the same way as a promise.
The idea is that 3rd-party libraries may implement "promise-compatible" objects of their own. They can have extended set of methods, but also be compatible with native promises, because they implement `.then`.
@ -244,7 +242,7 @@ This feature allows to integrate custom objects with promise chains without havi
In frontend programming promises are often used for network requests. So let's see an extended example of that.
We'll use the [fetch](mdn:api/WindowOrWorkerGlobalScope/fetch) method to load the information about the user from the remote server. The method is quite complex, it has many optional parameters, but the basic usage is quite simple:
We'll use the [fetch](info:fetch) method to load the information about the user from the remote server. It has a lot of optional parameters covered in separate chapters, but the basic syntax is quite simple:
```js
let promise = fetch(url);