01comments and 02logic-&-conditions files are added

Author: crescentpartha

stack-learner/chapter-03/01comments.js

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+
+// 019. JS Comments
+
+// The JavaScript comments are meaningful way to deliver message. 
+// It is used to add information about the code, warnings or suggestions so that end user can easily interpret the code.
+
+// There are two types of comments in JavaScript.
+
+// Single-line Comment (keyboard shortcut --> Ctrl + /)
+
+/* Multi-line Comment (keyboard shortcut --> Shift + Alt + A)
+line 2
+line 3
+line 4 */
+
+/* 
+    Advantages of JavaScript comments
+        To make code easy to understand
+        To avoid the unnecessary code 
+*/
+

stack-learner/chapter-03/02logic-&-conditions.js

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+
+// 20. JS Logic & Conditions
+
+/* 
+There are four options 
+    1. if condition 
+    2. else condition 
+    3. else if condition
+    4. switch statement 
+*/
+
+// 21. JS If condition
+
+// Conditional Operator 
+
+var a = 30
+var b = 200
+
+// a > b true false
+// if (condition) {
+//     // code 
+// }
+
+if (a > b) {
+    console.log(a + ' is greater than ' + b)
+}
+
+if (a < b) {
+    console.log(b + ' is greater than ' + a);
+}
+
+var n = 50
+
+if (n%2 == 0) {
+    console.log(n + ' is Even Number')
+}
+
+if (n%2 == 1) {
+    console.log(n + ' is Odd Number')
+}
+
+// 22. JS Else Condition
+
+a = 10
+b = 20
+
+if (a > b) {
+    console.log('A is greater than B')
+}
+else {
+    console.log('B is greater than A');
+}
+
+n = 50
+
+if (n%2 == 0) {
+    console.log(n + ' is Even Number')
+}
+else {
+    console.log(n + ' is Odd Number')
+}
+
+
+// 23. JS Else If condition
+
+a = 20
+b = 20
+
+if (a > b) {
+    console.log('A is greater than B')
+}
+else if (a < b) {
+    console.log('B is greater than A');
+}
+else {
+    console.log('They both are same number')
+}
+
+n = 1
+
+if (n == 0) {
+    console.log(n + ' is zero')
+}
+else if (n%2 == 0) {
+    console.log(n + ' is Even Number')
+}
+else {
+    console.log(n + ' is Odd Number')
+}
+
+
+// 24. JS Switch Statement
+
+var date = new Date()
+
+// 0 - Sunday, 1 - Monday, 2 - Tuesday
+// date.getDay() --> return current day 
+var today = date.getDay()
+
+// switch (today) {
+switch (8) {
+    case 0: 
+        console.log('Today is Sunday')
+        break
+    
+    case 1: 
+        console.log('Today is Monday')
+        break
+    
+    case 2: 
+        console.log('Today is Tuesday')
+        break
+    
+    case 3: 
+        console.log('Today is Wednesday')
+        break
+    
+    case 4: 
+        console.log('Today is Thursday')
+        break
+    
+    case 5: 
+        console.log('Today is Friday')
+        break
+    
+    case 6: 
+        console.log('Today is Saturday')
+        break
+    default:
+        console.log('Not a Valid Number')
+}
+