Last Sync: 2022-09-12 19:30:04
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2 changed files with 11 additions and 13 deletions
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@ -2,7 +2,6 @@
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categories:
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categories:
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- Programming Languages
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- Programming Languages
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tags:
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tags:
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- Programming_Languages
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- backend
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- backend
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- node-js
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- node-js
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- node-modules
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- node-modules
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@ -19,28 +18,28 @@ An HTTP server is another instance of an [event emitter](/Programming_Languages/
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_Creating a server_
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_Creating a server_
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```js
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```js
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const http = require('http');
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const http = require("http");
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const server = http.createServer(); // Create server as emitter
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const server = http.createServer(); // Create server as emitter
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// Register functions to run when listener is triggered
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// Register functions to run when listener is triggered
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server.on('connection', (socket) => {
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server.on("connection", (socket) => {
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console.log('new connection...');
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console.log("new connection...");
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});
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});
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server.listen(3000);
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server.listen(3000);
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console.log('Listening on port 3000');
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console.log("Listening on port 3000");
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```
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```
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This server is functionally equivalent to a generic event emitter:
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This server is functionally equivalent to a generic event emitter:
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```js
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```js
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// Raise an event
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// Raise an event
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const emitter = new EventEmitter('messageLogged');
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const emitter = new EventEmitter("messageLogged");
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// Register a listener
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// Register a listener
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emitter.on('messagedLogged', function () {
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emitter.on("messagedLogged", function () {
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console.log('The listener was called.');
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console.log("The listener was called.");
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});
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});
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```
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```
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@ -54,8 +53,8 @@ A socket is a generic protocol for client-server communication. Crucially it **a
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```js
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```js
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const server = http.createServer((req, res) => {
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const server = http.createServer((req, res) => {
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if (req.url === '/') {
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if (req.url === "/") {
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res.write('hello');
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res.write("hello");
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res.end();
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res.end();
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}
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}
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});
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});
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@ -67,8 +66,8 @@ Below is an example of using this architecture to return JSON to the client:
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```js
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```js
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const server = http.createServer((req, res) => {
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const server = http.createServer((req, res) => {
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if (req.url === '/products') {
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if (req.url === "/products") {
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res.write(JSON.stringify(['shoes', 'lipstick', 'cups']));
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res.write(JSON.stringify(["shoes", "lipstick", "cups"]));
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res.end();
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res.end();
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}
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}
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});
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});
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@ -2,7 +2,6 @@
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categories:
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categories:
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- Programming Languages
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- Programming Languages
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tags:
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tags:
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- Programming_Languages
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- shell
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- shell
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---
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---
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