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doc: add single arg scenario for util.format
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Set the expected outcome of `util.format('%%')` to be `%%`
instead of `%`.

PR-URL: #12374
Fixes: #12362
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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tarunbatra authored and MylesBorins committed May 15, 2017
1 parent 51d9806 commit 2fc806e
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7 changes: 7 additions & 0 deletions doc/api/util.md
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Expand Up @@ -133,6 +133,13 @@ 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
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