Merge pull request neetcode-gh#1442 from Mahim1997/dev/929_Java_Swift

929. Unique Email Addresses

Author: Ahmad-A0

java/929-Unique-Email-Addresses.java

@@ -0,0 +1,25 @@
+class Solution {
+    private String getFormattedEmail(String email) {
+        String[] arr = email.split("@");
+        String localName = arr[0];
+        String domainName = arr[1];
+
+        // Only keep the first part of "+" sign
+        String[] arrLocalWithPlus = localName.split("\\+");
+        localName = arrLocalWithPlus[0];
+
+        // Replace "."/dots
+        localName = localName.replace(".", "");
+
+        return localName + "@" + domainName;
+    }
+    
+    public int numUniqueEmails(String[] emails) {
+        Set<String> uniqueEmails = new HashSet<>();
+        for(String email: emails) {
+            String formattedEmail = getFormattedEmail(email);
+            uniqueEmails.add(formattedEmail);
+        }
+        return uniqueEmails.size();
+    }
+}

swift/929-Unique-Email-Addresses.swift

@@ -0,0 +1,28 @@
+class Solution {
+    func getFormattedEmail(from email: String) -> String {
+        let arr = email.split(separator: "@")
+
+        var localNameInitial = arr[0]
+        let domainName = arr[1]
+
+        // Ignore everything from first + (plus) sign
+        let arrLocalNameSplitPlus = localNameInitial.split(separator: "+")
+        guard let localNameWithoutPlus = arrLocalNameSplitPlus.first else { return "" }
+
+        // Remove . (dot) sign
+        let localName = localNameWithoutPlus.replacingOccurrences(of: ".", with: "")
+
+        return "\(localName)@\(domainName)"
+    }
+    
+    func numUniqueEmails(_ emails: [String]) -> Int {
+        var uniqueEmails: Set<String> = Set()
+
+        emails.forEach { email in
+            let formattedEmail = getFormattedEmail(from: email)
+            uniqueEmails.insert(formattedEmail)
+        }
+
+        return uniqueEmails.count
+    }
+}