day5.js

// Activity 1: Function Declaration

// Task 1: WAP to check if a number is even or odd and log the result to the console.

function oddEven(num) {
    if (num % 2 === 1)
        console.log("odd");
    else
        console.log("even");
}
oddEven(21);                            // output:odd

// Task 2: WAP to calculate the square of a number and return the result.

function square(num) {
    return num * num;
}
let num = 4;
console.log(square(num));               // output:16


// Activity 2: Function Expression

// Task 3: WAP expression to find the maximum of two numbers and log the result to the console.

let Max = function (num1, num2) {
    let max = (num1 > num2) ? num1 : num2;
    console.log(max);
};

Max(7, 3);                              // output:7

// Task 4: WAP expression to concatenate two strings and return the result.

let strconcatenate = function (str1, str2) {
    return str1 + str2;
}
let str = strconcatenate("Java", "Script");
console.log(str);                       // Output: JavaScript


// Activity 3: Arrow Functions

// Task 5: Write an arrow function to calculate the sum of two numbers and return the result.

let sum = (number1, number2) => number1 + number2;
console.log(sum(7, 3));                 // output: 10

// Task 6: Write an arrow function to check if a string contains a specific character and return a boolean value.

let check = (str, char) => str.includes(char);
console.log(check("JavaScript", 'S'));  // output:true

// Activity 4: Function Parameters and Default Values

// Task 7: WAP that takes two parameters and returns their product. Provide a default value for the second parameter.

let product = (num1, num2 = 9) => num1 * num2;
console.log(product(7, 3));             // output:21

// Task 8: WAP that takes a person's name and age and returns a greeting message. Provide a default value for the age.
function messsage(name, age = 18) {
    return `Welcome ${name}.Your age is ${age}`
}
console.log(messsage("Divyanshu", 21));  // output:Welcome Divyanshu.Your age is 21

// Activity 5: Higher-Order Functions

// Task 9: Write a higher-order function that takes a function and a number, and calls the function that many times.

function repeatFunction(func, num) {
    for (let i = 0; i < num; i++) {
        func();
    }
};
let num1 = 4, num2 = 9;
add = () => console.log(num1 += num2);
repeatFunction(add, 3);                  // output:13  
//                                       // 22
//                                       // 31


// Task 10: Write a higher-order function that takes two functions and a value, applies the first function to the value, and then applies the second function to the result.

function highorder(func1, func2, value) {
    return func2(func1(value));
}

function cube(num) {
    return num * num * num;
}

let ans = highorder(square, cube, 2);
console.log(ans);                         //output :64