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Ilya Kantor 2019-05-29 21:38:58 +03:00
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# File and FileReader
A [File](https://www.w3.org/TR/FileAPI/#dfn-file) object inherits from `Blob`, but is extended with filesystem-related capabilities.
A [File](https://www.w3.org/TR/FileAPI/#dfn-file) object inherits from `Blob` and is extended with filesystem-related capabilities.
There are two ways to obtain it.
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## FileReader
[FileReader](https://www.w3.org/TR/FileAPI/#dfn-filereader) is an object with the sole purpose of reading from `Blob` (and hence `File` too) objects.
[FileReader](https://www.w3.org/TR/FileAPI/#dfn-filereader) is an object with the sole purpose of reading data from `Blob` (and hence `File` too) objects.
It's event based, as reading from disk may take time.
It delivers the data using events, as reading from disk may take time.
The constructor:
@ -109,7 +109,7 @@ For Web Workers, there also exists a synchronous variant of `FileReader`, called
Its reading methods `read*` do not generate events, but rather return a result, as regular functions do.
That's only inside a Web Worker though, because delays and hang-ups in Web Workers are less important, they do not affect the page.
That's only inside a Web Worker though, because delays in synchronous calls, that are possible while reading from files, in Web Workers are less important. They do not affect the page.
```
## Summary