doc: add fs.open() multiple constants example

PR-URL: #33281 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>
nodejs · May 19, 2020 · 38f4440 · 38f4440
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commit 38f4440
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diff --git a/doc/api/fs.md b/doc/api/fs.md
@@ -5434,6 +5434,24 @@ The following constants are exported by `fs.constants`.
 
 Not every constant will be available on every operating system.
 
+To use more than one constant, use the bitwise OR `|` operator.
+
+Example:
+
+```js
+const fs = require('fs');
+
+const {
+  O_RDWR,
+  O_CREAT,
+  O_EXCL
+} = fs.constants;
+
+fs.open('/path/to/my/file', O_RDWR | O_CREAT | O_EXCL, (err, fd) => {
+  // ...
+});
+```
+
 ### File Access Constants
 
 The following constants are meant for use with [`fs.access()`][].