Masking of variable length string in JavaScript

Question

I want to mask a string in ReactJS, as in replacing the first N characters with the * symbol. But I want N to be variable.

Example:

const item = '1234567890'
const masked = masked(item, 6);
console.log(masked); // '******7890'

Answer 1

If I get you correctly you could just try this:

const item = '1234588567890';

// How many letters you want to leave readable at the end
const cutoff = 4;
const formattedItem = '*'.repeat(item.length - cutoff) + item.slice(-cutoff);

console.log(formattedItem)