Update javascript and ruby notes

Author: Yutsuten

notes/language/javascript/fetch.md

@@ -3,10 +3,37 @@ title: Fetch
 ref: https://developer.mozilla.org/en-US/docs/Web/API/Window/fetch
 ---
 
-## Basic
+## Request
 
-Issue a GET request:
+A [Request](https://developer.mozilla.org/en-US/docs/Web/API/Request/Request)
+is built of an `input` (URL) and `options`.
+
+Make a GET request:
+
+```js
+fetch('https://example.com/').then(callback);
+```
+
+Make a `application/json` POST request:
+
+```js
+const url = 'https://example.com/';
+const options = {
+    headers: { 'Content-Type': 'application/json' },
+    method: 'POST',
+    body: JSON.stringify({ username: 'example' }),
+};
+fetch(url, options).then(callback);
+```
+
+## Response
+
+A [Response](https://developer.mozilla.org/en-US/docs/Web/API/Response)
+object is returned.
 
 ```js
-fetch('https://example.com/').then(res => console.log(res.status));
+fetch('https://example.com/').then((res) => {
+  console.log(res.status);
+  res.text().then((text) => console.log(text));
+});
 ```

notes/language/javascript/nodejs/built_in.md

@@ -0,0 +1,10 @@
+---
+title: Built-in
+ref: https://nodejs.org/api/process.html
+---
+
+## Process
+
+| Variable      | Description                               |
+| ------------- | ----------------------------------------- |
+| `process.env` | A object containing the user environment. |

notes/language/lua/built-in.md notes/language/lua/built_in.md

@@ -16,6 +16,12 @@ Open the interactive console:
 irb
 ```
 
+## Variables
+
+| Variable | Description                             |
+| -------- | --------------------------------------- |
+| `ENV`    | A hash containing the user environment. |
+
 ## Functions
 
 Simple printing:

notes/language/python/built-in.md notes/language/python/built_in.md

@@ -11,6 +11,8 @@ Library to make HTTP requests.
 require 'net/http'
 ```
 
+## Request
+
 Make a GET request:
 
 ```ruby
@@ -25,3 +27,14 @@ url = URI('https://example.com/')
 data = JSON.generate(myhash)
 Net::HTTP.post(url, data, { 'content-type': 'application/json' })
 ```
+
+## Response
+
+A [Net::HTTPResponse](https://docs.ruby-lang.org/en/3.4/Net/HTTPResponse.html)
+object is returned.
+
+```ruby
+res = Net::HTTP.post(...)
+puts res.code
+puts res.body
+```

notes/language/ruby/builtin.md notes/language/ruby/built_in.md

@@ -1,5 +1,5 @@
 ---
-title: Built-ins
+title: Built-in
 man: zshbuiltins
 ---