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| <html> | |
| <head> | |
| </head> | |
| <body>HELLO JAVASCRIPT | |
| <script src="js/app.js"></script> | |
| </body> | |
| </html> |
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| console.log("Introduction to JavaScript") | |
| let a = 10 | |
| let name = "John" | |
| const pi = 3.142 // use const for values that don't change | |
| //pi = 3.5 // error because we are changing the const value | |
| // functions | |
| function sayHello() { | |
| console.log("Hello!") | |
| } | |
| // call the function sayHello | |
| sayHello() | |
| displayName("John Doe") | |
| function displayName(name) { | |
| console.log(name) | |
| } | |
| displayName("John Doe") | |
| function add(firstNumber, secondNumber) { | |
| //print(firstNumber) | |
| console.log(firstNumber + secondNumber) | |
| } | |
| add(2,3) | |
| function getName(name) { | |
| return name + " Doe" | |
| } | |
| let fullName = getName("John") | |
| console.log(fullName) | |
| // ARRAYS | |
| let tasks = [] // creating an empty array | |
| // add items to the array | |
| tasks.push("Wash the car") // index = 0 | |
| tasks.push("Feed dog") // index = 1 | |
| console.log(tasks) | |
| // DELETING ITEMS ARRAY USING POP | |
| // tasks.pop() will remove the element without returning the removed element | |
| //let deletedTask = tasks.pop() | |
| //console.log(deletedTask + " has been removed!") | |
| // DELETING ITEM BASED ON INDEX | |
| //delete tasks[0] | |
| //console.log(tasks) // [empty, "Feed dog"] | |
| // DELETING ITEM USING SPLICE | |
| //tasks.splice(0,1) | |
| //console.log(tasks) | |
| // ITERATING AN ARRAY | |
| //for index in range(0,len(tasks),1): | |
| // print(index) | |
| //index = index + 1 | |
| //index += 1 | |
| //index++ | |
| for(let index = 1; index <= 10; index++) { | |
| console.log(index) | |
| } | |
| // reverse order | |
| for(let index = 10; index > 0; index--) { | |
| console.log(index) | |
| } | |
| // print items of the array | |
| for(let index = 0; index < tasks.length; index++) { | |
| console.log(tasks[index]) | |
| } | |
| console.log(tasks[0]) // wash the car | |
| console.log(tasks[1]) // Feed dog | |
| console.log(tasks[10]) // accessing index which does not exist | |
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