text: function lowerToUpper(character) {
      //Write a function that prints whether a given character is upper-case or lower-case.
      //See: https://stackoverflow.com/questions/1027224/how-can-i-test-if-a-letter-in-a-string-is-uppercase-or-lowercase-using-javascrip AND https://jsperf.com/isupper-comparison/5
  
      //1)Convert input character case in upper (or lower)
      //2)Verify input character with converted input character
  
      let upperConvertCharacter = character.toUpperCase();
  
      if (character === upperConvertCharacter) {
          console.log('upper-case');
      } else {
          console.log('lower-case');
      }
  }
  
  lowerToUpper('L');     //upper-case
  lowerToUpper('f');  //lower-case
  