got undefined loop through obj array using forEach

Question

I do console.log(entry.passengers) I got this

[{"name":"james"},{"name":"john"},{"name":"abc"}]

But why I got undefined when I used forEach?

entry.passengers.forEach(function(i,obj){
  console.log(obj.name); // undefined
});

Look at the order of arguments to the callback in developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Barmar
– Barmar, Commented Oct 28, 2015 at 4:27
You have been corrupted, the order of parameters passed to the callback is value, index. — RobG
– RobG, Commented Oct 28, 2015 at 4:29

Tushar · Accepted Answer · 2015-10-28 04:26:58Z

4

The first parameter to forEach is the element and second parameter is the index.

entry.passengers.forEach(function(obj, i) {
//                                ^^^  ^ Change the sequence

var arr = [{
  "name": "james"
}, {
  "name": "john"
}, {
  "name": "abc"
}];

arr.forEach(function(e, i) {
  console.log(e, i);

  document.write(e.name + '<br />');
});

answered Oct 28, 2015 at 4:26

Tushar

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4 Comments

user3519144 Over a year ago

so it's opposite of $.each?

Tushar Over a year ago

@user3519144 the order of parameters, yes.

user3519144 Over a year ago

thanks! didn't know that! must be careful next time.

RobG Over a year ago

@user3519144—yes, jQuery has it backwards.

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