# Eloquent Javascript: Exercises

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## Looping a triangle

Write a loop that makes seven calls to console.log to output the following triangle:

``````#
##
##
###
####
####
#####
``````
``````    let i = 0;
while (i++ < 7) console.log("#".repeat(i));``````

## FizzBuzz

Write a program that uses console.log to print all the numbers from 1 to 100, with two exceptions. For numbers divisible by 3, print "Fizz" instead of the number, and for numbers divisible by 5 (and not 3), print "Buzz" instead. When you have that working, modify your program to print "FizzBuzz" for numbers that are divisible by both 3 and 5 (and still print "Fizz" or "Buzz" for numbers divisible by only one of those).

``````let i = 1
do {
divBy3 = i % 3 === 0
divBy5 = i % 5 === 0
switch (true) {
case (divBy3 && divBy5):
console.log('FizzBuzz')
break
case (divBy3):
console.log('Fizz')
break
case (divBy5):
console.log('Buzz')
break
default:
console.log(i)
}
} while (i++ <= 100)``````

## Chessboard

Write a program that creates a string that represents an 8×8 grid, using newline characters to separate lines. At each position of the grid there is either a space or a "#" character. The characters should form a chessboard. Passing this string to console.log should show something like this:

`````` # # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
# # # #
``````

When you have a program that generates this pattern, define a binding size = 8 and change the program so that it works for any size, outputting a grid of the given width and height.

``````const drawBoard = function (size) {
let row = 0
let str = ''
while (row++ < size) {
let col = 0
let offset = row % 2
while (col++ < size) {
str += ((col + offset) % 2) == 0 ? " " : "#"
}
str += "\n"
}
console.log(str)
}
drawBoard(8)``````