<pre class="shiki github-dark shaku"><code>/** * Clarifying question * will maxage takes second or millisecond */// enable myCookiefunction install() { const cookieMap = {}; // O(n) SC Object.defineProperty(document, 'myCookie', { set(input) { const cookieDetails = input.split(';'); const [cookieInfo, expirationInfo = ''] = cookieDetails; const [rawKey, rawValue] = cookieInfo.split('='); const key = rawKey.trim(); const value = rawValue.trim(); const [, timeout] = expirationInfo.split('='); const data = { value, expiry: Number(timeout * 1000) + Date.now() , // it will be undefined if no timeout }; cookieMap[key] = data; }, get() { const result = []; // SC - O(n) // loop through the array for(const [key, data] of Object.entries(cookieMap)){ // O(n) TC // check if expires if(data.expiry &amp;&amp; Date.now() &gt;= data.expiry){ // if expired, ignored that entry // continue; // or delete cookieMap[key]; // preferred as we are cleaning what is not used anymore } else{ const keyValuePair = `${key}=${data.value}`; result.push(keyValuePair) } } return result.join("; "); // need a space after ; while joining. it wont add ; in the end // optimise space complexity // 1. use string in place of array , but need to take care of proper formatting // 2. the next solution is to optimize space complexity return Object.entries(cookieMap).filter(([key, { expiry }]) =&gt; { if (!expiry) { return true; } if (Date.now() &gt;= expiry) { delete cookieMap[key]; return false; } return true; }) .map(([key, data]) =&gt; `${key}=${data.value}`).join('; ') }, /** * we need to enable configurable property of this prop of object to true * this is required because - * 1. we want to delete this prop in uninstall * 2. during testing (test cases run), the window.myCookie will be redefined mulitple times */ configurable: true })}// disable myCookiefunction uninstall() { // your code here delete document.myCookie; // delete direclty deletes a property from object}</code></pre>

easy solution by krishna saini using object.defineproperty

Snap

We can get and set cookie by document.cookie. document.cookie = 'bfe=dev'// "bfe=dev"document.cookie = 'bfe1=dev1'// "bfe1=dev1"document.cookie// "bfe…