JSFiddle - React, Tailwind, and code Playground

by adelura

JavaScript

function assert(actual, expected) {
    if(actual !== expected) {
    		document.write(`Expected ${actual} to be ${expected}. </br>`);
    } else {
        document.write('Test pass');
    }
}

function mask() {
}

assert(mask('012345678'), '*****5678');
assert(mask('12345678'), '****5678');
assert(mask('5678'), '5678');
assert(mask('123'), '123');
assert(mask(''), '');