Created
July 11, 2017 15:03
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developer tools > console | |
4 + 5 | |
9 * 2 | |
12 / 4 | |
2 ** 3 | |
true && false | |
true || false | |
age = 19 | |
name = "Hasssan" | |
message = "Hello I am " + name | |
hisAge = 14 | |
difference = age - hisAge | |
message = name + " is " + difference + " years older than him" | |
number1 = 7 | |
number2 = 8 | |
number3 = number1 * number2 | |
number1 > number2 | |
number3 == number1 | |
check1 = number1 < number2 | |
check2 = number2 >= number3 | |
check3 = check1 || check2 | |
window.addEventListener('load', function() { | |
// log to the console | |
console.log("Hello console from script.js") | |
// write in HTML document | |
document.write("<h1>This is a heading</h1>") | |
document.write("<p>a long long paragaph</p>") | |
// Using tempelate string to write to multiple lines | |
fewMoreLines = ` | |
<h1>HEADING 1</h1> | |
<h2>HEADING 2</h2> | |
<h3>HEADING 3</h3> | |
` | |
document.write(fewMoreLines) | |
// Data types | |
string = '4' | |
number = 4 | |
boolean = true // or false | |
console.log(str + number) | |
console.log(str == number) // type conversion | |
console.log(str === number) | |
// Math Functions | |
let a = 25 | |
let b = 49 | |
let max = Math.max(a,b) | |
let min = Math.min(a,b) | |
let squareRootOfA = Math.sqrt(a) | |
let aSquared = Math.pow(a, 2) | |
console.log(a, b) | |
console.log(max, min) | |
console.log(squareRootOfA) | |
console.log(aSquared) | |
// User Input (alert box) | |
let name = prompt("What is your name?") | |
document.write("<h1>"+ name +"</h1>") | |
document.write(`<h1>${name}</h1>`) | |
// User Input is read as a string | |
let number = prompt("Enter a number to be doubled") | |
let numberDoubled = number + number // Will concatenate | |
alert(numberDoubled) | |
// You need to use parseInt(str) convert the type | |
let str = prompt("Enter a number to be doubled") | |
let number = parseInt(str) | |
let numberDoubled = number + number // Addition | |
alert(numberDoubled) | |
// Strings | |
let str = "This is some string" | |
console.log(str.length) | |
console.log(str.charAt(1)) // "h" | |
console.log(str.toLowerCase()) | |
console.log(str.toUpperCase()) | |
}) |
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