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doc: document deprecation of util._extend

Document that util._extend was never intended to be used
and should be considered deprecated.

PR-URL: #4903
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
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benjamingr authored and jasnell committed Jan 27, 2016
1 parent 939d6ef commit d8290286b310cb8aed289f869444e0ada9b21465
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  1. +10 −0 doc/api/util.markdown
@@ -567,6 +567,16 @@ Deprecated predecessor of `console.log`.

Deprecated predecessor of `console.log`.

## util._extend(obj)
Stability: 0 - Deprecated: Use Object.assign() instead.
`_extend` was never intended to be used outside of internal NodeJS modules. The
community found and used it anyway.
It is deprecated and should not be used in new code. JavaScript comes with very
similar built-in functionality through `Object.assign`.
[`Array.isArray`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
[constructor]: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/constructor
[Customizing `util.inspect` colors]: #util_customizing_util_inspect_colors

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