Question

How to mask a number with stars except the first 6 and the last 4 digits in TypeScript

Answer 1

function maskNumberWithStarsExceptFirstSixAndLastFour(cardNumber: string) : string {
    const first6Digits: string = cardNumber.substring(0, 6);
    const last4Digits: string = cardNumber.substring(cardNumber.length - 4);
   
    const requiredMask: string = '*'.repeat(cardNumber.length - first6Digits.length - last4Digits.length);
   
    return first6Digits + requiredMask + last4Digits;
}
 
const cardNumber: string = '7003125934556789';
const maskedNumber: string = maskNumberWithStarsExceptFirstSixAndLastFour(cardNumber);
 
console.log(maskedNumber);
 
 
   
   
/*
run:
 
"700312******6789" 
   
*/

 

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