use GOOGLE

function isLGSeven(num) {

    if (isNaN(num) || num < 0) {

        return "please input a valid number"

    }

    const minusSeven = num - 7;

    if (minusSeven < 7) {

        return minusSeven;

    } else if (minusSeven >= 7) {

        return num * 2;

    }

}

const num = 15;

console.log(isLGSeven(num))

//output: 30

function gemsToDiamond(friendOne, friendTwo, friendThree) {

    if ((isNaN(friendOne) || isNaN(friendTwo) || isNaN(friendThree))) {

        return "input a valid number"

    }

    const firstFriend = friendOne * 21;

    const secondFriend = friendTwo * 32;

    const thirdFriend = friendThree * 43;

    let totalGamsOfFriend = firstFriend + secondFriend + thirdFriend;

    if (totalGamsOfFriend >= 1000 * 2) {

        const total = totalGamsOfFriend - 2000;

        return total

    } else {

        return totalGamsOfFriend;

    }

}

const friendOneGems = 10;

const friendTwoGems = 20;

const friendThreeGems = 30;

​

console.log(gemsToDiamond(friendOneGems, friendTwoGems, friendThreeGems))

//output: 140

// Problem: Find the maximum value in an array

​

const numbers = [5, 2, 9, 1, 7];

​

// Approach 1: Using Math.max() and spread operator

const max1 = Math.max(...numbers);

console.log(max1); // Output: 9

​

// Approach 2: Using a loop

let max2 = numbers[0];

for (let i = 1; i < numbers.length; i++) {

  if (numbers[i] > max2) {

    max2 = numbers[i];

  }

}

console.log(max2); // Output: 9

function printLinkedList(head) {

​

let cur=head 

while(cur){

    console.log(cur.data)

    cur=cur.next

}

}

​