script.js

//  Comments

// this is single line
// This is comment

/*
This 
is 
multi 
line 
comment
*/
// multi line comment can end in one line also

const hibox = /* hi this comment can end on this line */ (x,y)=>{
    return x+y
}

// to print any text
{
console.log("hi, everyone")
}

// DataTypes
null // null (nothing)
123 // number (any number)
Symbol('hi') // Symbol
"Hello" // String (any text in doble quates, single quates or backtick(You'll know where is backtick is used for in line 237))
BigInt(654321) // BigInt (Big numbers (Same as number))
true // Boolen (can be false)
undefined // Undefined (not defined but can be defined at later)
// You can use ; at end of DataTypes

/*
Null
Number
Symbol
String
Bigint
Boolen
Undefined

N N S S B B U
*/

// box (code in box will not globel[for whole code] So, variabe and functions will not be globel)
{
    // You can make box in box
    {
        // And box (Gose to infinite)
        {
            
        }
    }
}

// Variables (contaners to store DataTypes  by let var const)
let a = "hello" // best and not globely
var b = "hello" // globely (but, can us in loop when we want loop variable globaly)
const c = "hello" // Same as let but also contain function, box and object n key with box 

// Operator
/*

// Arithmetic Operator
{
1+2 // Addition
1-2 // Subtraction\
1*2 // Multiplication
1/2 // Diviation
1++2 // + 1 
1--2 // -1
1**2 // Exponantion (power of)
}

// Assignment Operator
{
1 += 2 // Same a ` 1 + 2 `   //fox in
let a1 = 1
a1 +=  2 // Same a `a = 1 + 2 `
1 -= 2
1 *= 2
1 /= 2
}

// Comparison Operator
{
== // Equal to
!= // Not equal to
=== // Equal value and type
!== // Not equal value and type
> // Greater than
< // Less than
>= // Greater than and equal to 
<= // Less than and equal to
? // Termary oprator
}

// Logical Operator
{
&& // logical and
|| // logical or
! // logical not
}

*/
// Function
{

    function hello(){
        console.log("Hello, wrold")
    }
hello()

}
// Function can written also like this:

const plus = (x,y)=>{
    console.log(x+y)
}


// Loops
// For loops
// For loop
{

    for (i = 1; i<10; i++){
        console.log(i+1)
    }

}

// for in loop
{
    // To print every object
    const obj = {
            Pratyush: 80,
            Rohan: 72,
            Shiva: 49,
            Lovish: 64,
    
        }
    
        for (let a in obj){
            console.log(a)
        }
    }
    // To print every key
    {
        const obj = {
            Pratyush: 80,
            Rohan: 72,
            Shiva: 49,
            Lovish: 64,
    
        }
    
        for (let a in obj){
            console.log(obj[a])
        }
    }
    // To print every object with "marks of"
    {
        const obj = {
            Pratyush: 80,
            Rohan: 72,
            Shiva: 49,
            Lovish: 64,
    
        }
    
        for (let a in obj){
            console.log("marks of " + a)
        }
    }
    // To print every key with "is "
    {
        const obj = {
            Pratyush: 80,
            Rohan: 72,
            Shiva: 49,
            Lovish: 64,
    
        }
    
        for (let a in obj){
            console.log("is " + a)
        }
    }
    // To print marks of student in readable way
    {
        const obj = {
            Pratyush: 80,
            Rohan: 72,
            Shiva: 49,
            Lovish: 64,
    
        }
        {
    
        for (let a in obj){
            console.log("marks of " + a + " is " + obj[a])
        }
    }
}

// for of loop
{
    for (let b of "Pratyush"){
        console.log(b)
    }
}


// lets run plus function

plus(16,4) 


// String
let myName = "Pratyush"
console.log(myName)

// Length
console.log(myName.length)

// Write Characters
console.log(myName[0])
console.log(myName[1])
console.log(myName[2])
console.log(myName[3])
console.log(myName[4])
console.log(myName[5])
console.log(myName[6])
console.log(myName[7])

// String interploation
// console.log( `hi my name is `${myName}`` ) // If backtick is there

// let a2 =  "Hi' //don't do
// let a2 = `hi' // Can do
// let a2 = `hi" // Can do

// Escape sequance Character
// let fruite = 'bana'na'
let fruite = 'bana\'na'
console.log(fruite)

// type Escape sequance Characters

/*
{

\n (new line)
\t (tab)
\r Carrige return

}
*/

// String properties and Methods
let name1 = "Pratyush"
console.log(name1.length) // prints 8

let name2 = "Pratyush"
console.log(name2.toLocaleUpperCase()) //prints PRATYUSH

let name3 = "Pratyush" 
console.log(name3.toLocaleLowerCase()) // prints pratyush

//           Pratyush
//           ^^^^^^^^
//           01234567     

let name4 = "Pratyush"
console.log(name4.slice(0)) // prints P
console.log(name4.slice(1)) // prints r
console.log(name4.slice(2)) // prints a
console.log(name4.slice(3)) // prints t
console.log(name4.slice(4)) // prints y
console.log(name4.slice(5)) // prints u
console.log(name4.slice(6)) // prints s
console.log(name4.slice(5)) // prints h
console.log(name4.slice(2,4)) // prints at

console.log(name4[0]) // prints P
console.log(name4[1]) // prints r
console.log(name4[2]) // prints a
console.log(name4[3]) // prints t
console.log(name4[4]) // prints y
console.log(name4[5]) // prints u
console.log(name4[6]) // prints s
console.log(name4[7]) // prints h

let name5 = "Pratyush"
console.log(name5.replace("Pratyush", "kumar")) // prints kumar

let name52 = "Pratyush bhai"
console.log(name2.replace("bhai", "bro")) // prints Pratyush bro

let name53 = "Pratyush"
console.log(name53.replace("Pra", "Ara")) // prints Aratyush

let name6 = "Pratyush"
let friend = "Aarav "
console.log(name6.concat(" is friend of ", friend)) // prints Pratyush is friend of Aarav  

let name7 = "          Pratyush          "
console.log(name7.trim()) // prints Pratyush

let sentence = 'The quick brown fox jumps over the lazy dog.';
let word = 'fox2';
console.log(sentence.includes(word))

// QuikQuiz:  Use for loop to print a string in js
let myString = "Hello, World!";

for (let i = 0; i < myString.length; i++) {
  console.log(myString[i]);
}

// QuikQuiz:  Write a program to find out whether a student a is pass or fail; if it requires total 40% pass and at least 33% in each subject to pass. Assume 3 subjects and take marks as an imput from the user.

/*
// Function to check if the student passes or fails
function checkPassOrFail(Hindi, English, Maths) {
    // Calculate total marks and percentage
    const totalMarks = Hindi + English + Maths;
    const percentage = (totalMarks / 80) * 100;

    // Check pass/fail conditions
    if (percentage >= 40 && Hindi >= 33 && English >= 33 && Maths >= 33) {
        return "Congratulations! You have passed.";
    } else {
        return "Sorry, you have failed. Better luck next time.";
    }
}

// Example usage
const subject1Marks = parseFloat(prompt("Enter marks for Hindi out of 80:"));
const subject2Marks = parseFloat(prompt("Enter marks for English out of 80:"));
const subject3Marks = parseFloat(prompt("Enter marks for Maths out of 80:"));

// Validate input
if (isNaN(subject1Marks) || isNaN(subject2Marks) || isNaN(subject3Marks)) {
    console.log("Please enter valid numerical values for marks.");
} else {
    // Display result
    const result = checkPassOrFail(subject1Marks, subject2Marks, subject3Marks);
    console.log(result);
}
*/


// Array
let array = [0,1,2,3,4,5,6,7,8,9]

let marksOf12th = [800,450,679,4,730,104,98,135,348,0, null, 31, false, "Not present",735,163,(404),391,496,241,714,688,8,377,(143),522,522,529,344,390,380,210,86,56,162,166,704,606,6,32,449,(400),199,,47,692,781,61] // out of 800

console.log(marksOf12th[0])
console.log(marksOf12th[1])
console.log(marksOf12th[2])
console.log(marksOf12th[3])
console.log(marksOf12th[4])
console.log(marksOf12th[5])
console.log(marksOf12th[6])
console.log(marksOf12th[7])
console.log(marksOf12th[8])
console.log(marksOf12th[9])
console.log(marksOf12th[10])
console.log(marksOf12th[11])
console.log(marksOf12th[12])
console.log(marksOf12th[13])
console.log(marksOf12th[14])
console.log(marksOf12th[15])
console.log(marksOf12th[16])
console.log(marksOf12th[17])
console.log(marksOf12th[18])
console.log(marksOf12th[19])
console.log(marksOf12th[20])
console.log(marksOf12th[21])
console.log(marksOf12th[22])
console.log(marksOf12th[23])
console.log(marksOf12th[24])
console.log(marksOf12th[25])
console.log(marksOf12th[26])
console.log(marksOf12th[27])
console.log(marksOf12th[28])
console.log(marksOf12th[29])
console.log(marksOf12th[30])
console.log(marksOf12th[31])
console.log(marksOf12th[32])
console.log(marksOf12th[33])
console.log(marksOf12th[34])
console.log(marksOf12th[35])
console.log(marksOf12th[36])
console.log(marksOf12th[37])
console.log(marksOf12th[38])
console.log(marksOf12th[39])
console.log(marksOf12th[40])
console.log(marksOf12th[41])
console.log(marksOf12th[42])
console.log(marksOf12th[43])
console.log(marksOf12th[44])
console.log(marksOf12th[45])
console.log(marksOf12th[46])
console.log(marksOf12th[47])
console.log(marksOf12th[48])

console.log(marksOf12th.length)

marksOf12th[26] = 516

console.log(marksOf12th)

let numbers = [1 , 2 ,3 , 4]
console.log(numbers)

console.log(numbers.toString()) // converts array into string 

console.log(numbers.join(" and ")) // Replaces , to join number with given text in string

console.log(numbers.pop) // Will remove last item from array

let lastOfNumbersArray = numbers.pop() // will return last number of array
console.log(lastOfNumbersArray)

console.log(numbers.push(56)) // Will add new element to end of array

console.log(numbers.shift()) // Will remove first item from array

console.log(numbers.unshift(78)) // Will add new element to start of array

console.log(delete numbers[0])

let numbers_more = [5, 6, 7, 8]

console.log(numbers.concat(numbers_more))

let words = ['bro', 'wanna', 'zebra', 'jack', 'king', 'f###', 'forbidden']
console.log(words.sort)

// # DOM.js
document.title = "Dom JavaScript Library" // DOM title is for changing the title.

console.log(document.title); // It will print the title with title element.

// document.body(); // DOM body is for selecting the body element.

// document.body(); // DOM body is for selecting the body element.
console.log(document.body); // It will print the body element.