code_questions_workbook_review.rb

# Q13
# The code snippet below looks for the first two elements that are out of order and swaps them; however, it is not producing the correct results. Rewrite the code so that it works correctly.

arr = [5, 22, 29, 39, 19, 51, 78, 96, 84]

index = 0

copy = arr[0..arr.length - 1]

while index < arr.length - 1
  # make a copy of the arr
  if arr[index] > arr[index + 1]
    # instead of using the arr values in the assignment use the copy values
    arr[index] = arr[index + 1]
    arr[index + 1] = arr[index]
  end 
  index += 1
end

# Q14
# Demonstrate your algorithmic thinking through completing the following two tasks, in order:
# 1. Create a flowchart to outline the steps for listing all prime numbers between 1 and 100 (inclusive). Your flowchart should make use of standard conventions for flowcharts to indicate processes, tasks, actions, or operations
# 2. Write pseudocode for the process outlined in your flowchart

# starting at number 2 for the first number to test
# make a loop that will run all the way until 100
# increment the number by 1 every time the loop runs
# initialize a new divider and set it at 2
# inside of the outer loop have an inner loop that will run the number of times for the number that we're currently up to
# if we're up to number 5 this inner loop will run 5 times
# inside of this loop have an if statement
# the if statement is doing a modulo calculation
# it would be the current number % the divider
# an example 5 % 2
# we're checking if this calculation results in a 0
# if the calculation is 0 we know that the current number isn't a prime
# an example, 4 % 2 equals 0
# therefore we can break out of this loop
# we increment the divider by 1 if the result of the last if statement isn't 0
# if the current number is equal to the divider we know that the number is prime and wen push it into an array
# an example 5 % 5 will actually run
# therefore we know the number is prime

# Q16
# An allergy test produces a single numeric score which contains the information about all the allergies the person has (that they were tested for). The list of items (and their value) that were tested are:
#  - eggs (1)
#  - peanuts (2)
#  - shellfish (4)
#  - strawberries (8)
#  - tomatoes (16)
#  - chocolate (32)
#  - pollen (64)
#  - cats (128)

# So if Tom is allergic to peanuts and chocolate, he gets a score of 34.

# Write a program that, given a person’s score can tell them:
#  a) whether or not they’re allergic to a given item
#  b) the full list of allergies.

allergies = {
  cats: 128,
  pollen: 64,
  chocolate: 32, 
  tomatoes: 16,
  strawberries: 8,
  shellfish: 4,
  peanuts: 2,
  eggs: 1
}

toms_score = 34
array_of_allergies = []

allergies.each do |key, value|
  if toms_score == 0
    break
  end
  if toms_score >= value  
    toms_score = toms_score - value
    array_of_allergies << key
  end 
end 

def allergic_to?(array_of_allergies, item)
  array_of_allergies.include?(item)
end

p allergic_to?(array_of_allergies, :peanuts)