Question

How to check if a letter in a string is lowercase in JavaScript

Answer 1

const s = "JavaScript";

let letter = s[1];

if (letter === letter.toLowerCase()) {
    console.log("yes");
} else {
    console.log("no");
}
          
 
/*
run:
 
yes
 
*/

 

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Answer 2

function isLowerCase(ch) {
    return ch === ch.toLowerCase() &&
           ch !== ch.toUpperCase();
}

const str = 'Java9sc_ript';
 
console.log(isLowerCase(str[0]));
console.log(isLowerCase(str[1]));
console.log(isLowerCase(str[4]));
console.log(isLowerCase(str[7]));
  
  
  
/*
run:
        
false
true
false
false
      
*/

 

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