Added project files from How to call Native C++ Shared Objects from Node.js, Text to Speech in Node.js, Introduction to using XPath in JavaScript, How to Get Started With JS IPFS and Node.js

Author: VLabStudio

How to Get Started With JS IPFS and Node.js/app.js

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+// Import dependencies
+const IPFS = require("ipfs"); // vs js-ipfs-http-client
+
+(async () => {
+
+    const node = await IPFS.create();
+    console.log("Node started!");
+
+    try {
+
+        const files = [{
+            path: "/tmp/myfile2.txt",
+            content: `
+                <!DOCTYPE html>
+                <html>
+                    <head>
+                        <title>IPFS</title>
+                    </head>
+                    <body>
+                        <h1>Hi Node.js</h1>
+                    </body>
+                </html>
+            `
+        }];
+
+        const file = {
+            path: "/tmp/myfile2.txt",
+            content: `
+                <!DOCTYPE html>
+                <html>
+                    <head>
+                        <title>IPFS</title>
+                    </head>
+                    <body>
+                        <h1>Hi Node.js 4</h1>
+                    </body>
+                </html>
+                `
+        };
+
+        // for await (const result of node.add(file)) {
+        //     console.log(result.cid.toString());
+        // }
+
+        // for await (const result of node.cat("Qma8GKVh93ogeAQ4FYBXmZDjKbb68RnhkWt16AyWnMA5h9")) {
+        //     console.log(result.toString());
+        // }
+
+        // Generator functions - https://stackoverflow.com/questions/44593309/object-generator-function-not-doing-what-it-should-and-returning-no-result
+        console.log((await node.cat("Qma8GKVh93ogeAQ4FYBXmZDjKbb68RnhkWt16AyWnMA5h9").next()).value.toString());
+
+
+    } catch (error) {
+        console.error("Node failed to start!", error);
+        await node.stop();
+    }
+
+})();

How to Get Started With JS IPFS and Node.js/package.json

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+{
+  "name": "get-started-with-js-ipfs",
+  "version": "1.0.0",
+  "description": "",
+  "main": "app.js",
+  "dependencies": {
+    "bs58": "^4.0.1",
+    "ipfs": "^0.41.0"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "MIT"
+}

Introduction to using XPath in JavaScript/index.html

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+<!DOCTYPE html>
+<html>
+<head>
+    <title>XPath</title>
+    <link rel="stylesheet" href="style.css">
+</head>
+<body>
+    <div id="red-box"></div>
+    <div id="green-box"></div>
+    <div></div>
+    <div id="blue-box">
+        <div id="yellow-box"></div>
+        <input type="email">
+    </div>  
+</body>
+</html>

Introduction to using XPath in JavaScript/style.css

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+* {
+    margin: 0px;
+    padding: 0px;
+}
+
+#red-box {
+    width: 200px;
+    height: 200px;
+    background-color: red;
+    display: inline-block;
+}
+
+#green-box {
+    width: 200px;
+    height: 200px;
+    background-color: green;
+    display: inline-block;
+}
+
+#blue-box {
+    width: 404px;
+    height: 404px;
+    background-color: blue;
+    display: inline-block;
+}
+
+#yellow-box {
+    width: 200px;
+    height: 200px;
+    background-color: yellow;
+    display: inline-block;
+}

Text to Speech in Node.js/app.js

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+// Import dependencies
+const say = require("say");
+
+// Use default system voice and speed
+say.speak("Today will make node speak");
+
+// // Set the speed
+// say.speak("Hello!", "", 0.5);
+
+// Stop the text currently being spoken
+// say.stop();
+
+// Export Voice to file
+// const filename = "hello.wav";
+// say.export("Hello!", "", 0.75, filename, function (err) {
+//     if (err) {
+//         return console.error(err);
+//     }
+
+//     console.log(`Text has been saved to ${filename}`);
+// });

Text to Speech in Node.js/package.json

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+{
+  "name": "make-your-computer-talk",
+  "version": "1.0.0",
+  "description": "",
+  "main": "app.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "say": "^0.16.0"
+  }
+}

Working with DLLs in Node.js/How to call Native C++ Shared Objects from Node.js/C++/MathLibrary.cpp

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+extern "C" int Subtract(int num1, int num2)
+{
+    return num1 - num2;
+}
+
+extern "C" int Add(int num1, int num2)
+{
+    return num1 + num2;
+}

Working with DLLs in Node.js/How to call Native C++ Shared Objects from Node.js/Node.js/MathLibrary.so

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+/*
+Node 10 and lower
+    npm i ffi
+    https://www.npmjs.com/package/ffi
+    https://github.com/node-ffi/node-ffi
+Node 11 and 12
+    npm i @saleae/ffi
+    https://www.npmjs.com/package/@saleae/ffi
+    https://github.com/lxe/node-ffi/tree/node-12
+Node 13 and higher
+    npm i ffi-napi
+    https://www.npmjs.com/package/ffi-napi
+    https://github.com/node-ffi-napi/node-ffi-napi
+*/
+
+// Import dependencies
+const ffi = require("ffi-napi");
+
+// Import math library
+const mathLibrary = new ffi.Library("./MathLibrary", {
+    "Subtract": [
+        "int", ["int", "int"]
+    ],
+    "Add": [
+        "int", ["int", "int"]
+    ]
+});
+
+console.log(mathLibrary.Subtract(15, 5));

Working with DLLs in Node.js/How to call Native C++ Shared Objects from Node.js/Node.js/app.js

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+{
+  "name": "ffi-on-linux",
+  "version": "1.0.0",
+  "description": "",
+  "main": "app.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "ffi-napi": "^2.4.6"
+  }
+}