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doc: fix links in Addons docs
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Put links in a lexical order. Add missing links. Remove duplicates.

PR-URL: #5072
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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estliberitas authored and Myles Borins committed Mar 17, 2016
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43 changes: 22 additions & 21 deletions doc/api/addons.markdown
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# Addons

Node.js Addons are dynamically-linked shared objects, written in C or C++, that
can be loaded into Node.js using the `require()` function, and used just as if
they were an ordinary Node.js module. They are used primarily to provide an
interface between JavaScript running in Node.js and C/C++ libraries.
can be loaded into Node.js using the [`require()`][require] function, and used
just as if they were an ordinary Node.js module. They are used primarily to
provide an interface between JavaScript running in Node.js and C/C++ libraries.

At the moment, the method for implementing Addons is rather complicated,
involving knowledge of several components and APIs :
Expand All @@ -12,7 +12,7 @@ involving knowledge of several components and APIs :
JavaScript implementation. V8 provides the mechanisms for creating objects,
calling functions, etc. V8's API is documented mostly in the
`v8.h` header file (`deps/v8/include/v8.h` in the Node.js source
tree), which is also available [online][].
tree), which is also available [online][v8-docs].

- [libuv][]: The C library that implements the Node.js event loop, its worker
threads and all of the asynchronous behaviors of the platform. It also
Expand Down Expand Up @@ -118,7 +118,7 @@ Node.js as part of `npm`. This version is not made directly available for
developers to use and is intended only to support the ability to use the
`npm install` command to compile and install Addons. Developers who wish to
use `node-gyp` directly can install it using the command
`npm install -g node-gyp`. See the `node-gyp` [installation instructions] for
`npm install -g node-gyp`. See the `node-gyp` [installation instructions][] for
more information, including platform-specific requirements.*

Once the `binding.gyp` file has been created, use `node-gyp configure` to
Expand All @@ -134,7 +134,7 @@ version of `node-gyp` to perform this same set of actions, generating a
compiled version of the Addon for the user's platform on demand.
Once built, the binary Addon can be used from within Node.js by pointing
`require()` to the built `addon.node` module:
[`require()`][require] to the built `addon.node` module:
```js
// hello.js
Expand Down Expand Up @@ -184,17 +184,17 @@ dependencies.
### Loading Addons using require()

The filename extension of the compiled Addon binary is `.node` (as opposed
to `.dll` or `.so`). The `require()` function is written to look for files
with the `.node` file extension and initialize those as dynamically-linked
to `.dll` or `.so`). The [`require()`][require] function is written to look for
files with the `.node` file extension and initialize those as dynamically-linked
libraries.

When calling `require()`, the `.node` extension can usually be
When calling [`require()`][require], the `.node` extension can usually be
omitted and Node.js will still find and initialize the Addon. One caveat,
however, is that Node.js will first attempt to locate and load modules or
JavaScript files that happen to share the same base name. For instance, if
there is a file `addon.js` in the same directory as the binary `addon.node`,
then `require('addon')` will give precedence to the `addon.js` file and load it
instead.
then [`require('addon')`][require] will give precedence to the `addon.js` file
and load it instead.

## Native Abstractions for Node.js

Expand All @@ -215,9 +215,10 @@ illustration of how it can be used.
## Addon examples

Following are some example Addons intended to help developers get started. The
examples make use of the V8 APIs. Refer to the online [V8 reference][] for help
with the various V8 calls, and V8's [Embedder's Guide][] for an explanation of
several concepts used such as handles, scopes, function templates, etc.
examples make use of the V8 APIs. Refer to the online [V8 reference][v8-docs]
for help with the various V8 calls, and V8's [Embedder's Guide][] for an
explanation of several concepts used such as handles, scopes, function
templates, etc.

Each of these examples using the following `binding.gyp` file:

Expand Down Expand Up @@ -1077,14 +1078,14 @@ Test in JavaScript by running:
const addon = require('./build/Release/addon');
```

[online]: https://v8docs.nodesource.com/
[libuv]: https://github.com/libuv/libuv
[bindings]: https://github.com/TooTallNate/node-bindings
[download]: https://github.com/nodejs/node-addon-examples
[node-gyp]: https://github.com/nodejs/node-gyp
[V8 reference]: https://v8docs.nodesource.com/
[Embedder's Guide]: https://developers.google.com/v8/embed
[Native Abstrations for Node.js]: https://github.com/nodejs/nan
[examples]: https://github.com/nodejs/nan/tree/master/examples/
[bindings]: https://github.com/TooTallNate/node-bindings
[Linking to Node.js' own dependencies]: #linking-to-nodejs-own-dependencies
[installation instructions]: https://github.com/nodejs/node-gyp#installation
[libuv]: https://github.com/libuv/libuv
[Linking to Node.js' own dependencies]: #linking-to-nodejs-own-dependencies
[Native Abstrations for Node.js]: https://github.com/nodejs/nan
[node-gyp]: https://github.com/nodejs/node-gyp
[require]: globals.html#globals_require
[v8-docs]: https://v8docs.nodesource.com/

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