String.prototype.isUpperCase = function() {
  if (!/^[a-zA-Z]+$/.test(this.toString())) return false;
  return this.toString() === this.toUpperCase()
}
String.prototype.isLowerCase = function() {
  if (!/^[a-zA-Z]+$/.test(this.toString())) return false;
  return this.toString() === this.toLowerCase()
}

helpful. thought id send it

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