need help writing a function, maskify, which: Takes a string or number and changes all but the last four characters into '#'. The function should return a string.   hint  javascript  Of course, we’ll have to use a loop. We could loop from the beginning to end or the other way around (right to left), it doesn’t much matter. But the most important piece to figure out in this loop: How do we know when we’re in the last 4 characters, and when we’re not in the last four characters. Remember, to find the last character in a string/array, we use someStr.length - 1. We can use the same to find the 2nd-to-last character by using someStr.length - 2 and so forth.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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need help writing a function, maskify, which:

  • Takes a string or number and changes all but the last four characters into '#'.

  • The function should return a string.

 

hint  javascript 

Of course, we’ll have to use a loop. We could loop from the beginning to end or the other way around (right to left), it doesn’t much matter. But the most important piece to figure out in this loop: How do we know when we’re in the last 4 characters, and when we’re not in the last four characters. Remember, to find the last character in a string/array, we use someStr.length - 1. We can use the same to find the 2nd-to-last character by using someStr.length - 2 and so forth.

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