Solved Task 3

fibonacci.js

@@ -0,0 +1,26 @@
+const assert = require("assert")
+
+const fibonacci_rec = function(n) {
+    assert.ok(Number.isInteger(n), "n is not an Integer!")
+    if(n == 0) {
+        return 0
+    } else if (n == 1) {
+        return 1
+    } else {
+        return fibonacci_rec(n - 1) + fibonacci_rec(n - 2)
+    }
+}
+
+const fibonacci_opt = function(n) {
+    const g = function(n) {
+        return (1 + Math.sqrt(5)) / 2
+    }
+    assert.ok(Number.isInteger(n), "n is not an Integer!")
+    if(n == 0) {
+        return 0
+    } else if (n == 1) {
+        return 1
+    } else {
+        
+    }
+}

hello-world.js

@@ -0,0 +1,18 @@
+/**
+ *  WBE-Demo
+ *  Einfacher Hello-World-Webserver
+ */
+const http = require('http')
+
+const hostname = '127.0.0.1'
+const port = 3000
+
+const server = http.createServer((req, res) => {
+	res.statusCode = 200
+	res.setHeader('Content-Type', 'text/plain')
+	res.end('Hello, World!\n')
+})
+
+server.listen(port, hostname, () => {
+	console.log(`Server running at http://${hostname}:${port}/`)
+})

package.json

@@ -0,0 +1,6 @@
+{
+  "dependencies": {
+    "assert": "^2.0.0",
+    "jslint": "^0.12.1"
+  }
+}

power.js

@@ -0,0 +1,47 @@
+const { AssertionError } = require('assert')
+const assert = require('assert')
+
+const power_for = function (base, exponent) {
+    let result = 1
+    for (let count = 0; count < exponent; count++) {
+      result *= base
+    }
+    return result
+  }
+   
+
+const power_rec = function (base, exponent) {
+    if(exponent == 0) {
+        return 1;
+    }
+    return base * power_rec(base, exponent - 1)
+}
+
+const power_rec_opt = function (base, exponent) {
+    if(exponent == 0) {
+        return 1;
+    }
+    else if(exponent % 2 == 0) { //gerade
+        let value = power_rec_opt(base, exponent / 2)
+        return value * value
+    } else { //ungerade
+        return base * power_rec_opt(base, exponent - 1)
+    }
+}
+
+const power = function(base, exponent){
+    assert.ok(Number.isInteger(base), "Exponent is not an Integer")
+    assert.ok(Number.isInteger(exponent), "Exponent is not an Integer")
+    assert.ok(base >= 0)
+    assert.ok(exponent >= 0)
+    return power_rec_opt(base, exponent)
+} 
+
+//console.log("With for Loop: " + power_for(2, 10))                   // → 1024
+//console.log("With recursion: " + power_rec(2, 10))                  // → 1024
+//console.log("With recursion optimized: " + power_rec_opt(2, 10))    // → 1024
+
+// console.log(power(2, 10))      // → 1024
+// console.log(power(2, 2.5))     // !! AssertionError
+
+module.exports = { power }