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doc: add example for file existence with fs.stat #8585

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doc: add example for file existence with fs.stat
Sep 17, 2016
fdc7952
clarify doc according to discussion in pull request
Oct 4, 2016
50a5435
fix line length
Oct 7, 2016
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11 changes: 11 additions & 0 deletions doc/api/fs.md
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Expand Up @@ -1517,6 +1517,16 @@ Asynchronous stat(2). The callback gets two arguments `(err, stats)` where
`stats` is a [`fs.Stats`][] object. See the [`fs.Stats`][] section for more
information.

In case of an error, the `err.code` will be one of [Common System Errors][].

Using `fs.stat()` to check for the existence of a file before calling
`fs.open()`, `fs.readFile()` or `fs.writeFile()` is not recommended.
Instead, user code should open/read/write the file directly and handle the
error raised if the file is not available.

To check if a file exists without manipulating it afterwards, [`fs.access()`]
is recommended.

## fs.statSync(path)
<!-- YAML
added: v0.1.21
Expand Down Expand Up @@ -2200,3 +2210,4 @@ The following constants are meant for use with the [`fs.Stats`][] object's
[`event ports`]: http://illumos.org/man/port_create
[`ReadDirectoryChangesW`]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365465%28v=vs.85%29.aspx
[`AHAFS`]: https://www.ibm.com/developerworks/aix/library/au-aix_event_infrastructure/
[Common System Errors]: errors.html#errors_common_system_errors