/**
 * 
 * Ashish Patel
 * e: ashishsushilPatel@gmail.com
 * w: https://ashish.me
 *
 */

/* 
Check whether the given string is a subsequence of the plaintext alphabet.

Example

For s = "effg" or s = "cdce", the output should be alphabetSubsequence(s) = false

For s = "ace" or s = "bxz", the output should be alphabetSubsequence(s) = true.
 */

function alphabetSubSequence(values) {
  const chars = values.split('')
  const charValues = []

  chars.forEach((character) => {
    charValues.push(character.charAt(0))
  })

  if([...new Set(charValues)].length !== chars.length){
    return false
  }

  for (let index = 0; index < charValues.length; index++) {
    if(chars[index] >= charValues[index +1]){
      return false
    }
  }

  return true
}

test('alphabet Sub Sequence', () => {
  expect(alphabetSubSequence('effg')).toEqual(false)
  expect(alphabetSubSequence('cdce')).toEqual(false)
  expect(alphabetSubSequence('ace')).toEqual(true)
  expect(alphabetSubSequence('bxz')).toEqual(true)
});