Question

How to add spaces to a number every 4 digits in JavaScript

Answer 1

const cardNumber = "9003125334656789";

const cardNumberWithSpaces = cardNumber.replace(/(.{4})/g, "$1 ");

console.log(cardNumberWithSpaces);

 
 
/*
run:
 
9003 1253 3465 6789 
 
*/

 

70+ SQL courses for beginners and professionals

Answer 2

const cardNumber = "9003125334656789";

const cardNumberWithSpaces = cardNumber.match(/.{1,4}/g);
 
console.log(cardNumberWithSpaces);
console.log(cardNumberWithSpaces.join(' '));

  
  
/*
run:
  
[ '9003', '1253', '3465', '6789' ]
9003 1253 3465 6789
  
*/

 

70+ SQL courses for beginners and professionals