Question

How to check if a value is letter in JavaScript

Answer 1

            
function is_letter(ch) { 
    return ch.length === 1 && ch.match(/[a-z]/i);
} 
   

document.write(is_letter('a') + "<br />");  
document.write(is_letter('3') + "<br />");    
document.write(is_letter('!') + "<br />");   
 


/*
run:
    
a
null
null
    
*/

 

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