javascript - Add items to an array skipping duplicates -


i want add items array skipping duplicates. reason 1 item being added , second item not being added. here code.

var add = ['email1@gmail.com', 'email2@gmail.com', 'email1@gmail.com']; var main_messages = [] var  function findmessages(messagelist) {   return messagelist = from; }  add.map(function(map){   = map   if(main_messages.find(findmessages) === undefined){     main_messages.push(map)   } });  console.log(main_messages)

so expected output should 

['email1@gmail.com', 'email2@gmail.com']

but output i'm getting in code only

['email1@gmail.com']

what doing wrong , how can fix problem?

looks you're missing = in return statement of findmessages, you're setting from messagelist instead of comparing. here's fixed code

var add = ['email1@gmail.com', 'email2@gmail.com', 'email1@gmail.com'];  var main_messages = []  var   function findmessages(messagelist) {    return messagelist === from;  }    add.map(function(map){    = map    if(main_messages.find(findmessages) === undefined){      main_messages.push(map)    }  });    console.log(main_messages)


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