Question

How to determines whether a character is a uppercase in JavaScript

Answer 1

var ch = 'A';
if (islower(ch))
    document.write("yes<br />");
else
    document.write("no<br />");
      
var ch = 'a';
if (islower(ch))
    document.write("yes<br />");
else
    document.write("no<br />");
 
  
function islower(ch){
    return ch !== ch.toLowerCase() && ch == ch.toUpperCase() 
}
  
/*
run:
    
yes
no
      
*/

 

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