Question

How to extract uppercase characters (capital letters) from a string in JavaScript

Answer 1

function extract_uppercase_letters(s) { 
    const len = s.length;
    let uppercaseChars = ""; 
           
    for (let i = 0; i < len; i++) { 
         if (s[i] >= 'A' && s[i] <= 'Z') 
             uppercaseChars += s[i];
    } 
    
    return uppercaseChars; 
} 
      
  
const s = "JAjaVvAaSscCRripItPT"; // JAVASCRIPTjavascript

const ucl = extract_uppercase_letters(s);
        
console.log(ucl);
  
  
  
/*
run:
   
JAVASCRIPT
   
*/

 

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Answer 2

const s = "JAjaVvAaSscCRripItPT"; // JAVASCRIPTjavascript

const uppercaseChars = s.match(/[A-Z]/g);

console.log(uppercaseChars);

  
  
/*
run:

[
  'J', 'A', 'V', 'A',
  'S', 'C', 'R', 'I',
  'P', 'T'
]
   
*/

 

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