Question

How to invert the letters case in a String uppercase to lowercase and lowercase to uppercase in JavaScript

Answer 1

var s = 'JavaScript Programming';

s = InvertLettersCase(s);
document.write(s + "<br />");

document.write(InvertLettersCase("python") + "<br />");
  
function InvertLettersCase(s) 
{
    var tmp = "";
    
     for(i = 0; i < s.length; i++) 
     {
         if (s.charCodeAt(i) >= 65 && s.charCodeAt(i) <= 90)
             tmp += s.charAt(i).toLowerCase();
         else if (s.charCodeAt(i) >= 97 && s.charCodeAt(i) <= 122)
                  tmp += s.charAt(i).toUpperCase();
              else
                  tmp += s.charAt(i);    
     }
     return tmp;
}
  
/*
run:
    
jAVAsCRIPT pROGRAMMING
PYTHON
      
*/

 

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