doc: add single arg scenario for util.format

Set the expected outcome of `util.format('%%')` to be `%%` instead of `%`. PR-URL: #12374 Fixes: #12362 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Refael Ackermann <[email protected]> Reviewed-By: Vse Mozhet Byt <[email protected]> Reviewed-By: Alexey Orlenko <[email protected]> Reviewed-By: Evan Lucas <[email protected]> Reviewed-By: Colin Ihrig <[email protected]>
nodejs · May 2, 2017 · ed13016 · ed13016
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commit ed13016
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diff --git a/doc/api/util.md b/doc/api/util.md
@@ -135,6 +135,13 @@ Each argument is converted to a string using `util.inspect()`.
 util.format(1, 2, 3); // '1 2 3'
 ```
 
+If only one argument is passed to `util.format()`, it is returned as it is
+without any formatting.
+
+```js
+util.format('%% %s'); // '%% %s'
+```
+
 ## util.inherits(constructor, superConstructor)
 <!-- YAML
 added: v0.3.0