frequencies.rb

def frequencies(text)
  # intro downcase the string, and create an empty hash
  frequency = {}
  text = text.downcase
  # 1. split the string into an array of words
  words = text.split
  # words => ["the", "lazy", ...]

  # 2. iterate over the array
  words.each do |word|
    # each: count how many times it is in the text
    if frequency.key?(word)
      # in our hash update the word and amount
      frequency[word] += 1
      # frequency['the'] += 1
    else
      # set to one
      frequency[word] = 1
      # frequency['the'] = 1
    end
  end
  # 3. return the hash
  return frequency
end

p frequencies("the lazy dog jumped over the brown fox")
# {"the" => 2, "fox" => 1, ...}

# OTHER ADVANCED SOLUTION👇

def frequencies(text)
  # intro downcase the string, and create an empty hash
  frequency = Hash.new(0)
  text = text.downcase
  # 1. split the string into an array of words
  words = text.split
  # words => ["the", "lazy", ...]

  # 2. iterate over the array
  words.each do |word|
    # each: count how many times it is in the text
    frequency[word] += 1
  end
  # 3. return the hash
  return frequency
end

p frequencies("the lazy dog jumped over the brown fox")
# {"the" => 2, "fox" => 1, ...}

frequencies_spec.rb

require_relative "../frequencies"

describe "#frequencies" do
  it "returns an empty Hash when passed an empty string" do
    # TODO
    frequencies_hash = frequencies("")
    expect(frequencies_hash).to eq({})

  end

  it "counts multiple words" do
    frequencies_hash = frequencies("the fox the")
    expect(frequencies_hash).to eq({"the" => 2, "fox" => 1})
  end
end

quizz.rb

# Q8
grades = [19, 8, 11, 15, 13]
# TODO: compute and store the result in a variable `average`

sum = 0

grades.each do |grade|
  sum += grade
end

average = sum / grades.size.to_f
# p sum

# Q.9
fruits = ["banana", "peach", "watermelon", "orange"]
#         0         1         2             3
# Print out "peach" from the fruits array in the terminal
# puts fruits[1]

# Add an "apple" to the fruits array # Replace "watermelon" by "pear"
fruits << "apple"

# Delete "orange"
fruits.delete_at(3)

# Q.10
city = { name: "Paris", population: 2000000 }
# Print out the name of the city
# puts city[:name]

# Add the Eiffel Tower to city with the `:monument` key
city[:monument] = "Eiffel Tower"

# Update the population to 2000001
city[:population] = 2000001

# What will the following code return?
city[:mayor]
# => nil


# Q.11
# Use the map iterator to convert the variable students,
# an array of arrays, into an array of hashes.
# Those hashes should have two keys: `:name` and `:age`

students = [ [ "john", 28 ], [ "mary", 25 ], [ "paul", 21 ] ]

new_arr = students.map do |student|
  {name: student[0], age: student[1]}
end

p new_arr
# students = [ { name: "john", age: 28 ]}, {...} ]
#