check if a string contains only letters in Javascript

  const isStringOnlyLetters = (string) => {
    return /^[a-zA-Z]+$/.test(string);
  }

This code is used to check if a given string contains only letters. It uses a regular expression to test if the given string matches a pattern of characters from ‘a’ to ‘z’ (both uppercase and lowercase). First, a regular expression is declared with the range of letters from ‘a’ to ‘z’ (both uppercase and lowercase). Then the test method is used to run a check against the string to see if all of its characters are in the specified range. If all the characters match, it returns true. Otherwise, it returns false.