Bitwise flags for classifying characters.

CharacterClassifications.ts

enum CharacterClassifications {
  None                   = 0, 
  Digit                  = 1,  
  Upper                  = 2,
  Lower                  = 4,
  Space                  = 8,
  Control                = 16,
  SymbolOrPunctuation    = Upper | Lower, 
  AlphaOrDigit           = Digit | Upper | Lower | Space
}

const hasFlag = (what: CharacterClassifications, has: CharacterClassifications) => has === (has & what)

console.clear()
console.log("Upper has Upper. Should be true", 
  hasFlag(CharacterClassifications.Upper, CharacterClassifications.Upper))
console.log("SymbolOrPunctuation has Upper . Should be true", 
  hasFlag(CharacterClassifications.SymbolOrPunctuation, CharacterClassifications.Upper))
console.log("SymbolOrPunctuation has Lower. Should be true", 
  hasFlag(CharacterClassifications.SymbolOrPunctuation, CharacterClassifications.Lower))
console.log("AlphaOrDigit has Digit. Should be true", 
  hasFlag(CharacterClassifications.AlphaOrDigit, CharacterClassifications.Digit))
console.log("AlphaOrDigit has Upper. Should be true", 
  hasFlag(CharacterClassifications.AlphaOrDigit, CharacterClassifications.Upper))
console.log("AlphaOrDigit has Lower. Should be true", 
  hasFlag(CharacterClassifications.AlphaOrDigit, CharacterClassifications.Lower))