bbo/mask.js

bbo is a utility library of zero dependencies for javascript.

'use strict';

/**
 * Replaces all but the last num of characters with the specified mask character.
 */
var mask = function (cc) {
  var num = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 4;
  var mask = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : '*';
  return `${cc}`.slice(-num).padStart(`${cc}`.length, mask);
};

module.exports = mask;