add solution for 929 in js

Author: limbowandering

solution/929.Unique Email Addresses/Solution.js

@@ -0,0 +1,40 @@
+const numUniqueEmails2 = function(emails){
+  const emailFilter = function(str){
+    let index = str.search(/@/);
+    let s = str.substring(0,index);
+    let s2 = str.substring(index+1,str.length);
+    let res = '';
+    for(let i = 0; i < s.length; i++){
+      if(s[i] === '+') break;
+      if(s[i] === '.') continue;
+      res = res+s[i];
+    }
+    return res+s2;
+  }
+
+  let arr = [];
+  for(let i = 0; i < emails.length; i++){
+    let t = emailFilter(emails[i]);
+    if(arr.indexOf(t) === -1){
+      arr.push(t);
+    }
+  }
+  return arr.length;
+};
+
+const numUniqueEmails = function(emails){
+  let arr = emails.map(str=>{
+    let index = str.search(/@/);
+    let s = str.substring(0,index);
+    let s2 = str.substring(index+1,str.length);
+    let res = '';
+    for(let i = 0; i < s.length; i++){
+      if(s[i] === '+') break;
+      if(s[i] === '.') continue;
+      res = res+s[i];
+    }
+    return res+s2;
+  });
+  let set = new Set(arr);
+  return set.size;
+}