// functions in an array

function hello() {

console.log("Hello");

}

hello();

function print1to5() {

for (let i = 1; i <= 5; i++) {

console.log(i);

}

}

print1to5();

function isAdult() {

let age = 18;

let personAge = 25;

if (personAge >= age) {

console.log("You are an adult");

}

else {

console.log("You are not an adult");

}

}

isAdult();

// Practice Question

// Question 1

// Create a function that prints a poem

function printPoem() {

console.log("The sun shines bright in the sky,");

console.log("The birds sing their sweet melody,");

console.log("The flowers bloom with vibrant hue,");

console.log("A beautiful world, for me and you.");

}

printPoem();

// Question 2

// Create a function to roll a dice and always display the value of the dice (1 to 6)

function rollDice() {

let diceValue = Math.floor(Math.random() * 6) + 1;

console.log("You rolled a " + diceValue);

}

rollDice();

// Functions with Arguments

function printInfo(name, age) {

console.log(`${name}'s age is ${age}`);

}

printInfo("Inam", 19);

printInfo("Inam"); // order wise argruments access

function sum(a, b) {

console.log(a + b);

}

sum(5, 6);

sum(4567876, 456787);

// Practice Question

// Question 1

// Create a function that gives us the average of 3 numbers

function average(a, b, c) {

let avg = (a + b + c) / 3;

console.log(avg);

}

average(5, 6, 7);

average(5, 6); // error because of missing argument

average(5); // error because of missing argument

// Question 2

// Create a function that prints the multiplication table of a number.

function printTable(num) {

for (let i = 1; i <= 10; i++) {

console.log(`${num} * ${i} = ${num * i}`);

}

}

printTable(5);

printTable(10);

// recursion

function sum2(a, b) {

return a + b; // nothing will execute after return

}

console.log(sum2(sum2(1, 2), 3));

// Question 3

// get sum from 1 to 10

function getSum(n) {

let sum = 0;

for (let i = 1; i <= n; i++) {

sum += i;

}

return sum;

}

console.log(getSum(10));

// Question 4

// function that returns the concatenation of all strings in an array

let str = ["hi", "hello", "bye", "!"];

function concatStrings(arr) {

let result = "";

for (let i = 0; i < arr.length; i++) {

result += arr[i];

}

return result;

}

console.log(concatStrings(str));

// scope

// function scope

function calSum(a, b) {

// function scope

let sum = a + b;

console.log(sum);

}

calSum(5, 6); // sum will not access by outside the function

// block scope

{

let a = 25;

// it will not accessable out of the block

}

// lexical scope

function outer() {

let x = 10;

function inner() {

let a = 10;

console.log(x);

}

inner();

// 'a' variable is not access able here

}

outer(); // it will print 10

// Practice Questions

// Question 1

let greet = "Hello";

function changedGreet() {

// global greet variable is not available in the function

let greet = "Salam";

console.log(greet);

function innerGreet() {

// greet is not accessable here because its a block scope variable

console.log(greet);

}

}

console.log(greet);

changedGreet();

// Function Expressions

const sum3 = function (a, b) {

return a + b;

}

console.log(sum3(5, 16)); // it will print 21

// Higher order functions

function mulipleGreet(func, count) {

for (let i = 1; i <= count; i++) {

func();

}

}

let greet_ = function () {

console.log("Hello");

}

mulipleGreet(greet_, 100);

function oddEvenTester(request) {

if (request % 2 == 0) {

return function (n) {

console.log(!(n % 2 == 0));

}

} else if (request == "even") {

return function (n) {

console.log(n % 2 == 0);

}

} else {

return console.log("wrong descion");

}

}

let request = "odd";

// Methods

const calculator = {

num: 55,

add: function (a, b) {

return a + b;

},

sub: function (a, b) {

return a - b;

},

mul: function (a, b) {

return a * b;

},

div: function (a, b) {

return a / b;

},

square: function (a) {

return a * a;

},

cube: function (a) {

return a * a * a;

},

power: function (a, b) {

return Math.pow(a, b);

},

sqrt: function (a) {

return Math.sqrt(a);

},

abs: function (a) {

return Math.abs(a);

}

};

console.log(calculator.add(9, 5));

console.log(calculator.power(9, 5));