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Loops Lab

To complete this lab, do the following:

  1. Fork this repo
  2. Clone your forked repo
  3. Create a file called loops_lab.js inside your cloned repo
  4. Copy the description of the exercise as a comment
  5. Underneath the commented description write your code.
  6. Ensure your solutions work properly!
  7. Open PR against this repo.

Exercises

  1. Write a while loop and a for loop that takes the variable "num" and logs all the numbers, descending, between "num" and 1.

  2. Write a while loop and a for loop that takes the variable "max", and iterates over all numbers from 0 to "max". For each iteration, it will check if the current number is even or odd, and log that to the screen (e.g. "2 is even")

  3. Write a while loop and a for loop that takes the variable "x" and iterates over all numbers from 0 to "x". For each iteration of the loop, it will multiply the number of "x" by 9 and log the result (e.g. "2 * 9 = 18"). Bonus think of another way to solve it.

    Hint Find the final number and increment the loop by 9.
  4. Write code that prints/logs all the numbers that end in a 5 from 1 to 100, exclusive.

  5. Without running/executing your code, how many times will the loop below run? Explain why.

let i = 5;      

while (i > 3) {
    i += 1
}

// Your explanation here
  1. Write a loop that uses console.log to log all the numbers from 1 to 100, with two exceptions. For numbers divisible by 3, log "Fizz" instead of the number, and for numbers divisible by 5 (and not 3), log "Buzz" instead.

  2. Modify your program to log "FizzBuzz", for numbers that are divisible by both 3 and 5 (still log "Fizz" or "Buzz" for numbers divisible by only one of those).

Bonus:

  1. Write a program that would log the lyrics of the song 99 Bottles of Beer. This is the first verse of the song:
```
99 bottles of beer on the wall, 99 bottles of beer.
Take one down, pass it around, 98 bottles of beer on the wall.
```

This verse is repeated, each time with one less bottle, until the number of bottles is 0. When the number of bottles is 2, the verse is:

2 bottles of beer on the wall, 2 bottles of beer.
Take one down, pass it around, 1 bottle of beer on the wall.

In the last line, the word bottles (plural), is replaced with bottle (singular)

When the number of bottles is 1, the verse is:

1 bottle of beer on the wall, 1 bottle of beer.
Take one down, pass it around, No more bottle of beer on the wall.

  1. Use the assignGrade function (given below). Write a function that logs each number from 60 - 100 along with its corresponding letter score. Exp For each number from 81 to 90, log B, like so:
60 - F
...
81 - B
82 - B
83 - B
...
93 - A
94 - A
...
function assignGrade(score) {
    if (score > 90) {
        return 'A';
    } else if (score > 80) {
        return 'B';
    } else if (score > 70) {
        return 'C';
    } else if (score > 65) {
        return 'D';
    } else {
        return 'F';
    };
};
Hint Explore this:
let grade = assignGrade(80)
console.log(grade)

What is happening here? Can you explain it?


  1. Given an integer N draw a square of N x N asterisks. Look at the examples.

Example 1: Input: let N = 2

Output:

**
**

Example 2: Input: let N = 3

Output:

***
***
***
Hint 1 Try printing/logging a single line of * first.
Hint 2 You will need 2 loops for this.

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