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\subsubsection{Tolowercase():}  Returns the string with all of its characters converted to lowercase.  \verb|//toLowerCase()  var \verb|//toLowerCase()|  \verb|var  myString = 'JAVASCRIPT ROX';  myString ROX';|  \verb|myString  = myString.toLowerCase();  console.log(myString)  //output: myString.toLowerCase();|  \verb|console.log(myString)|  \verb|//output:  javascript rox| \subsubsection{Touppercase():}  Returns the string with all of its characters converted to uppercase.