1-fundamentals.js

/* ---------------------------------------------- */
// 1. How to declare a variable using let and const

const fatherName = 'Arnold';
let season = 'rainy';
season = 'winter';


/* ---------------------------------------------- */
// 2. Conditions

// 6 basic conditions: >, <, ===, !==, <=, >=
// multiple conditions: &&, ||

if (fatherName === 'arnold' || season === 'rainy') {

}
else if (fatherName === 'Arnold') {

}
else {

}


/* ---------------------------------------------- */
// 3. Array Declare

// index,
// length, push,

const numbers = [89, 35, 98, 12];
numbers[0] = 56;


/* ---------------------------------------------- */
// 4. for loop and while loop


// for loop
for (let i = 0; i < numbers.length; i++) {
    const number = numbers[i];
    confirm.log(number);
}


// while loop
let i = 0;
while (i < numbers.length) {
    const number = numbers[i];
    console.log(number);
    i++;
}


/* ---------------------------------------------- */
// 5. function

function multiply(num1, num2) {
    const result = num1 * num2;
    return result;
}

const output = multiply(35, 78);


/* ---------------------------------------------- */
// 6. Object

// 3 ways to access property by name

const student = {
    name: 'Salib Khan',
    age: 32,
    movies: ['king khan', 'Dhakar Mastan']
}

const myVariable = 'age';

console.log(student.age); // direct by property No-1

console.log(student['age']);// access via property name string No-2

console.log(student[myVariable]); // access via property name in a variable No-3