text = "source text banana banana banana ..."

// Transcoding map to convert keybords characters sequence to natural numbers: { 'q' => 0, 'w' => 1, ... }
characterCodesMap = "qwertyuiopasdfghjklzxcvbnm".mapWithIndex((character, index) => { return [character, index] }).toHash

// Character code ranges for keyboard rows
row1 = 0..9
row2 = 10..18
row3 = 19..25 // Actually this one will never be used

// Loop through each word
text.eachWord((word) => {
  inRange1 = true
  inRange2 = true
  inRange3 = true

  word.each((character) => {
    code = characterCodesMap[character]

    // Range inclusion check function suppose to work like this:
    // includes = (value) => { return (range1.first >= code) && (range1.last <= code) }

    inRange1 = inRange1 && code.inRange(row1)
    inRange2 = inRange2 && !inRange1 && code.inRange(row2)

    // Last range check is simplified
    inRange3 = inRange3 && !(inRange1 || inRange2)

    // Continue to the next work after range test fails first time
    if (!(inRange || inRange || inRange)) break;
  })

  if (inRange1) print("'#{word}' belongs to row 1")
  if (inRange2) print("'#{word}' belongs to row 2")
  if (inRange3) print("'#{word}' belongs to row 3")
})