gistfile1.txt

const testCases = [
  '123123123',
  'abc123',
  'aaabbbccc',
  '12345678'
]


function isUnique(string = ''){
  return (new Set(string)).size === string.length
}

function isUniqueBonus(string = ''){

  let unique = true;
  const existingChars = [];

  Array.from(string).forEach(char => {
    if(existingChars.includes(char)){
      unique = false;
      return;
    }
    existingChars.push(char)
  })

  return unique;
}



// Tests 
console.log('----- isUnique -----')
console.log(isUnique(testCases[0]) === false ? 'pass' : 'fails')
console.log(isUnique(testCases[1]) === true ? 'pass' : 'fails')
console.log(isUnique(testCases[2]) === false ? 'pass' : 'fails')
console.log(isUnique(testCases[3]) === true ? 'pass' : 'fails')

console.log('----- isUniqueBonus -----')
console.log(isUniqueBonus(testCases[0]) === false ? 'pass' : 'fails')
console.log(isUniqueBonus(testCases[1]) === true ? 'pass' : 'fails')
console.log(isUniqueBonus(testCases[2]) === false ? 'pass' : 'fails')
console.log(isUniqueBonus(testCases[3]) === true ? 'pass' : 'fails')