Question

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

Answer 1

const cardNumber: string = "7003125334556789";

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

console.log(cardNumberWithSpaces);

 
 
/*
run:
 
"7003 1253 3455 6789 "
 
*/

 

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Answer 2

const cardNumber: string = "7003125334556789";

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

 
 
/*
run:
 
["7003", "1253", "3455", "6789"] 
"7003 1253 3455 6789" 
 
*/

 

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