Look-and-say sequence

# title: Look-and-say sequence
# source: https://rosettacode.org/wiki/Look-and-say_sequence
# category: Rosetta Code
# difficulty: Easy
# summary: Generate terms of the look-and-say sequence where each term describes the digits of the previous one.
# tags: popular, strings, math, sequences
# vibe: 0.2

def look_and_say(term)
  result = ""
  i = 0

  while i < term.length
    char = term.slice(i)
    count = 1
    while i + count < term.length && term.slice(i + count) == char
      count = count + 1
    end
    result = result + count + char
    i = i + count
  end

  result
end

def sequence(n)
  terms = ["1"]
  i = 1
  while i < n
    terms = terms.push(look_and_say(terms[i - 1]))
    i = i + 1
  end
  terms
end

def run
  {
    term_1: look_and_say("1"),
    term_2: look_and_say("11"),
    term_3: look_and_say("21"),
    term_4: look_and_say("1211"),
    term_5: look_and_say("111221")
  }
end