929. Unique Email Addresses in Java and Swift

java/929-Unique-Email-Addresses.java

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+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

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+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
+ }
+}