Create 929-unique-email-addresses.js

Author: everthis

929-unique-email-addresses.js

@@ -0,0 +1,26 @@
+/**
+ * @param {string[]} emails
+ * @return {number}
+ */
+const numUniqueEmails = function(emails) {
+  const res = new Set()
+  emails.forEach(el => helper(el, res))
+  return res.size
+};
+
+function helper(str, s) {
+  const arr = str.split('@')
+  const p = arr[0]
+  const d = arr[1]
+  let res = ''
+  for(let i = 0, len = p.length; i < len; i++) {
+    if(p[i] === '.') {
+      continue
+    } else if(p[i] === '+') {
+      break
+    } else {
+      res += p[i]
+    }
+  }
+  s.add(`${res}@${d}`)
+}