Merge branch 'main' of https://github.com/PacktPublishing/JavaScript-from-Beginner-to-Professional into main

2021-11-24 19:32:29 +05:30
parent cbce47bc22 09d27448f1
commit 3d51b594b6
25 changed files with 274 additions and 0 deletions
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+<!DOCTYPE html>
+<html>
+ 
+<head>
+  <title>Tester</title>
+</head>
+ 
+<body>
+  <script>
+    console.log("hello world");
+  </script>
+</body>
+ 
+</html>
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+<!DOCTYPE html>
+<html>
+ 
+<head>
+  <title>Tester</title>
+</head>
+ 
+<body>
+  <script src="app.js"></script>
+</body>
+ 
+</html>
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+let a = 10; // assign a value of 10 to variable a
+console.log(a); // This will output 10 into the console
+/*
+This is a multi-line 
+Comment
+*/
+
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+<!doctype html>
+<html>
+  <head>
+    <title>JS Tester</title>
+  </head>
+  <body>
+    <script src="myJS.js"></script>
+  </body>
+</html>
+
+// console.log("Laurence");
+/*
+This is my comment
+Laurence Svekis
+*/
@@ -1 +1,13 @@
+let str1 = 'Laurence'; 
+let str2 = "Svekis"; 
+let val1 = undefined;
+let val2 = null;
+let myNum = 1000;
+
+
+console.log(typeof(str1));
+console.log(typeof(str2));
+console.log(typeof(val1));
+console.log(typeof(val2));
+console.log(typeof(myNum));

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+const myName = "Maaike";
+const myAge = 29;
+const coder = true;
+const message = "Hello, my name is " + myName + ", I am " + myAge+" years old and I can code JavaScript: " + coder + "."; 
+console.log(message);
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+let a = window.prompt("Value 1?");
+let b = window.prompt("Value 2?");
+a = Number(a);
+b = Number(b);
+let hypotenuseVal = ((a * a) + (b * b))**0.5;
+console.log(hypotenuseVal);
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+let a = 4;
+let b = 11;
+let c = 21;
+a = a + b;
+a = a / c;
+c = c % b;
+console.log(a, b, c);
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+//Convert miles to kilometers. 
+//1 mile equals 1.60934 kilometers.
+let myDistanceMiles = 130;
+let myDistanceKM = myDistanceMiles * 1.60934;
+console.log("The distance of " + myDistanceMiles + " miles is equal to " + myDistanceKM + " kilometers")
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+//1 inch = 2.54 centimetres.
+//2.2046 pounds in a kilo
+let inches = 72;
+let pounds = 180;
+let weight = pounds / 2.2046; // in kilos
+let height = inches * 2.54; // height in centimetres
+console.log(weight, height);
+let bmi = weight/(height/100*height/100);
+console.log(bmi);
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+const myList = ["Milk", "Bread", "Apples"];
+console.log(myList.length);
+myList[1] = "Bananas";
+console.log(myList);
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+const myList = [];
+myList.push("Milk", "Bread", "Apples");
+myList.splice(1, 1, "Bananas", "Eggs");
+const removeLast = myList.pop();
+console.log(removeLast);
+myList.sort();
+console.log(myList.indexOf("Milk"));
+myList.splice(1, 0, "Carrots", "Lettuce");
+const myList2 = ["Juice", "Pop"];
+const finalList = myList.concat(myList2, myList2);
+console.log(finalList.lastIndexOf("Pop"));
+console.log(finalList);
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+const myArr = [1, 2, 3];
+const bigArr = [myArr, myArr, myArr];
+console.log(bigArr[1][1]);
+console.log(bigArr[0][1]); 
+console.log(bigArr[2][1]);
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+const myCar = {
+    make: "Toyota",
+    model: "Camry",
+    tires: 4,
+    doors: 4,
+    color: "blue",
+    forSale: false
+};
+
+let propColor = "color";
+myCar[propColor] = "red";
+propColor = "forSale";
+myCar[propColor] = true;
+console.log(myCar.make + " " + myCar.model);
+console.log(myCar.forSale);
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+const people = {friends:[]};
+const friend1 = {first: "Laurence", last: "Svekis", id: 1};
+const friend2 = {first: "Jane", last: "Doe", id: 2};
+const friend3 = {first: "John", last: "Doe", id: 3};
+people.friends.push(friend1, friend2, friend3);
+console.log(people);
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+theList.pop(); 
+theList.shift(); 
+theList.unshift("FIRST"); 
+theList[3] = "hello World"; 
+theList[2] = "MIDDLE"; 
+theList.push("LAST"); 
+console.log(theList);
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+const inventory = [];
+const item3 = {
+    name: "computer",
+    model: "imac",
+    cost: 1000,
+    qty: 3
+}
+const item2 = {
+    name: "phone",
+    model: "android",
+    cost: 500,
+    qty: 11
+}
+const item1 = {
+    name: "tablet",
+    model: "ipad",
+    cost: 650,
+    qty: 1
+}
+inventory.push(item1, item2, item3);
+console.log(inventory);
+console.log(inventory[2].qty);
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+const test = false;
+console.log(test);
+if(test){
+    console.log("It's True");
+}
+if(!test){
+    console.log("False now");
+}
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+let age = prompt("How old are you?");
+age = Number(age);
+let message;
+if(age >= 21){
+    message = "You can enter and drink.";
+}else if(age >= 19){
+    message = "You can enter but not drink.";
+}else{
+    message = "You are not allowed in!";
+}
+console.log(message);
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+const id = true;
+const message = (id) ? "Allowed In" : "Denied Entry";
+console.log(message);
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+const randomNumber = Math.floor(Math.random() * 6);
+let answer = "Something went wrong";
+let question = prompt("Ask me anything");
+switch (randomNumber) {
+    case 0:
+        answer = "It will work out";
+        break;
+    case 1:
+        answer = "Maybe, maybe not";
+        break;
+    case 2:
+        answer = "Probably not";
+        break;
+    case 3:
+        answer = "Highly likely";
+        break;
+    default:
+        answer = "I don't know about that";
+}
+let output = "You asked me " + question + ". I think that " + answer;
+console.log(output);
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+let prize = prompt("Pick a number 0-10");
+prize = Number(prize);
+let output = "My Selection: ";
+switch (prize){
+    case 0: 
+        output += "Gold ";
+    case 1:
+        output += "Coin ";
+        break;
+    case 2:
+        output += "Big ";
+    case 3:
+        output += "Box of ";
+    case 4:
+        output += "Silver ";
+    case 5:
+        output += "Bricks ";
+        break;
+    default:
+        output += "Sorry Try Again";
+}
+console.log(output);
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+let val = prompt("What number?");
+val = Number(val);
+let num = 100;
+let message = "nothing";
+if (val > num) {
+    message = val + "  was greater than " + num;
+} else if (val === num) {
+    message = val + "  was equal to " + num;
+} else {
+    message = val + " is less than " + num;
+}
+console.log(message);
+console.log(message);
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+let person = prompt("Enter a name");
+let message;
+switch (person) {
+    case "John" :
+    case "Larry" :
+    case "Jane" :
+    case "Laurence" :
+    message = person + " is my friend";
+    break;
+    default :
+    message = "I don't know " + person;
+}
+console.log(message);
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+const myArr = ["Rock", "Paper", "Scissors"];
+let computer = Math.floor(Math.random() * 3); 
+let player = Math.floor(Math.random() * 3); 
+let message = "player " + myArr[player] + " vs computer " + myArr[computer] + " "; 
+if (player === computer) { 
+message += "it's a tie"; 
+} else if (player > computer) { 
+if (computer == 0 && player == 2) { 
+message += "Computer Wins"; 
+} else { 
+message += "Player Wins"; 
+} 
+} else { 
+if (computer == 2 && player == 0) { 
+message += "Player Wins"; 
+} else { 
+message += "Computer Wins"; 
+} 
+} 
+console.log(message);