Question

How to determines whether a character is a lowercase 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:
   
no
yes
     
*/

 

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