Update 0929-unique-email-addresses.js

Author: aestheticw3

javascript/0929-unique-email-addresses.js

@@ -1,11 +1,50 @@
-var numUniqueEmails = function(emails) {
-  const valid=emails.map(email=>{
-       const [local, domain] = email.split('@');
-       return local.split('+').shift().split('.').join('')+'@'+domain;
-   });
-   const set=new Set(valid)
-    
-    return set.size
-      
-    
+/**
+ * Built-in Functions Solution
+ * Hash Set - Unique Emails
+ * Time O(N * K) | Space O(N)
+ * https://leetcode.com/problems/unique-email-addresses
+ * @param {string[]} emails
+ * @return {number}
+ */
+var numUniqueEmails = function (emails) {
+	const valid = emails.map(email => {
+		const [local, domain] = email.split("@");
+		return (
+			local.split("+").shift().split(".").join("") + "@" + domain
+		);
+	});
+
+	return new Set(valid).size;
+};
+
+/**
+ * Manual Solution
+ * Hash Set - Unique Emails
+ * Time O(N * K) | Space O(N)
+ * https://leetcode.com/problems/unique-email-addresses
+ * @param {string[]} emails
+ * @return {number}
+ */
+var numUniqueEmails = function (emails) {
+	const uniqEmails = new Set();
+
+	for (let email of emails) {
+		let cleanEmail = "";
+		for (let i = 0; i < email.length; i++) {
+			if (email[i] === "@") {
+				cleanEmail += email.slice(i);
+				break;
+			} else if (email[i] === "+") {
+				while (email[i] !== "@") i++;
+				cleanEmail += email.slice(i);
+				break;
+			} else if (email[i] !== ".") {
+				cleanEmail += email[i];
+			}
+		}
+
+		uniqEmails.add(cleanEmail);
+	}
+
+	return uniqEmails.size;
 };