Resource¶

const names = [
    'HM Nayeem',
    'Aditya Chakraborty',
    'Abu Rayhan',
    'Shaker Hossain',
    'Akib Ahmad',
    'Alvi Chowdhury',
];
let index = -1;
let person = names[++index];

setInterval(() => {
    person = names[index++];
    console.log(person, person.length);

    if (index === names.length) {
        index = 0;
    }
}, 1000);

if (studyBasic) {
    wontJoin();
}

if (studyAdvanced) {
    join();
}

if (teacherSpeaks) {
    silent();
}

if (!teacherSpeaks) {
    shout();
}

// Scenario 1 - Single branch
// if condition
if (hasMoney) {
    buyPhone();
}

// Scenario 2 - Two branches
// if else condition
if (toss === 'head') {
    win();
} else {
    loss();
}

// Scenario 3 - Multiple branches
// else if
if (1 > 1) {
    big();
} else if (1 < 1) {
    small();
} else {
    same();
}

for (let i = 1; i <= 100; i++) {
    // it's a new js file,
    // we can write any valid js code here
    // every code written inside this block will execute multiple times
    console.log('Hello world!', i);
}

// There are total three types of loop available in JS
// 1. for (When we know the range)
// 1.1 Range
// 1.2 for in
// 1.3 for of
// 2. while (When we don't know the range)
// 3. do while *

while (true) {
    let num = Math.ceil(Math.random() * 100);
    console.log('Hello World', num);
    if (num === 99) break;
}

do {
    console.log('It will run at least once');
} while (false);

const name1 = 'Rayhan';
const name2 = 'Alvi';
const name3 = 'Anik';
const name4 = 'Arjun';
const name5 = 'Ayman';

const students = [
    'Rayhan',
    'Alvi',
    'Anik',
    'Arjun',
    'Ayman',
    'Ayuub',
    'Bidyut',
];

// console.log(students[0]);
// console.log(students[1]);
// console.log(students[2]);
// console.log(students[3]);
// console.log(students[4]);

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

// name1.sendEmail();
// name2.sendEmail();
// name3.sendEmail();
// name4.sendEmail();
// name5.sendEmail();

const nums = [1, 2, 3, 4, 5, 6];
const bools = [true, true, false, false];
const nulls = [null, null, null];
const undefineds = [undefined, undefined, undefined];
const arrayOfArray = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
];
const mixed = [true, null, 'Str', 5, [12, 2, 4]];

const student1 = {
    firstName: 'Abu',
    secondName: 'Rayhan',
    email: 'rayhan@example.com',
    age: 25,
    attend: true,
};

const student2 = {
    firstName: 'Alvi',
    secondName: 'Chowdhury',
    email: 'alvi@example.com',
    age: 25,
    attend: true,
};

const student3 = {
    firstName: 'Akib',
    secondName: 'Ahmad',
    email: 'akib@example.com',
    age: 25,
    attend: true,
};

const allStudents = [student1, student2, student3];

for (let i = 0; i < allStudents.length; i++) {
    sendMail(allStudents[i].email);
}

function sendMail(email) {
    console.log('Sending email to', email);
}

function nameOfFunction(name) {
    if (!name) {
        console.log('Please provide your name');
    } else {
        console.log('Hello', name);
    }
}

nameOfFunction('Murshed');
nameOfFunction('Fahim');
nameOfFunction();

function generateRandomNumber(min = 1, max) {
    const randomNumber = Math.floor(Math.random() * min + (max - min));
    return randomNumber;
}

console.log(generateRandomNumber(5, 10));