codewars solutions

codewars.rb

def get_middle(s)
  len = s.length
  if len == 1
    return s
  elsif len.even?
    return s[(len/2)-1] + s[(len/2)] 
  else
    return s[len/2]
  end
end
puts get_middle("blah")
puts get_middle("helpm")

def nb_year(p0, percent, aug, p)
  pop_init = p0
  pop_max = p
  pop_curr = pop_init
  pc_increase_yearly = 1 + percent.to_f/100
  pop_extras_yearly = aug
  years = 0
  until pop_curr >= pop_max
    pop_curr = ((pop_curr * pc_increase_yearly) + pop_extras_yearly).to_i
    puts pop_curr
    years += 1
  end
  years
end

puts nb_year(1500, 5, 100, 5000)
puts nb_year(1000, 2.0, 50, 1214) # 4

def XO(str)
  str.downcase.count('o').eql? str.downcase.count('x') 
end

def iq_test(numbers)
  h = { evens: [], odds: [] }
  numbers.split(" ").each_with_index do |val, index|
    h[:evens].push({val: val, index: index}) if val.to_i.even?
    h[:odds].push({val: val, index: index}) if val.to_i.odd?
  end
  return h[:evens].length < h[:odds].length ? h[:evens][0][:index]+1 : h[:odds][0][:index]+1
end

puts iq_test("2 4 7 8 10")
puts iq_test("1 2 2")

def disemvowel(str)
  new_str = str.split("").map { |char| char if not ["a","e","i","o","u"].include? char.downcase }.join("")
end

disemvowel("This website is for losers LOL!")

def high_and_low(numbers)
  numbers.split(" ").map { |s| s.to_i }.minmax.reverse.join(" ")
end
puts high_and_low("4 5 29 54 4 0 -214 542 -64 1 -3 6 -6")

def DNA_strand(dna)
  new_dna = []
  dna.split("").each do |char|
    if char.downcase == "a"
      new_dna.push("T")
    elsif char.downcase == "t"
      new_dna.push("A")
    elsif char.downcase == "c"
      new_dna.push("G")
    elsif char.downcase == "g"
      new_dna.push("C")
    else
      new_dna.push(char)
    end
  end
  new_dna.join("")
end

puts DNA_strand("ATTGC")