CODEWITHSUNDEEP
javascriptobject
Robert
Robert

Reputation: 816

checking key using 'for in' returns undefined

I'm checking to see if a key exists in an object from another object so I am doing something like this:

var user = {
  'email' : 'dothis',
  'derp' : 'yo'
};

And then I'm checking to see if it exists within this:

var cookies = {
  'email':'[email protected]'
}

I'm checking like this:

for(var key in cookies) {
  if(user[key]){
   // do this
  }
}

But no matter what I do it will return undefined. However it does work when I just do:

user['email'];

Which is correct.

EDIT: Let me add on to exactly what I'm doing.

So I'm getting all the cookies in the browser using this function:

getAllCookies : function(){
  var pairs = document.cookie.split(";");
  var cookies = {};
  for (var i=0; i<pairs.length; i++){
    var pair = pairs[i].split("=");
    cookies[pair[0]] = unescape(pair[1]);
  }
  return cookies;
}

From that I get the object cookies.

Upvotes: 3

Views: 79

Answers (1)

Ry-
Ry-

Reputation: 224862

There are spaces in a cookie string, so you need to trim the name first, or just split with whitespace:

var pairs = document.cookie.split(/\s*;\s*/);

Upvotes: 2

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