isAlpha

Callable

• isAlpha(str: string, extra?: string): boolean

---

• Check whether given str is alphabetic string.

  The allowed characters are A-Z, and a-z.

  Example

  isAlpha("foobar")
  // => true
  
  isAlpha("foobar123")
  // => false
  
  isAlpha("foobar123", "123")
  // => true

  ---

  Parameters

  • str: string

    The string to check for alphabetic characters.

  • optionalextra: string

    Extra characters that are allowed.

  Returns boolean

  str consists of alphabetic characters.