The length of JSON data retrieved may vary between Internet Explorer and Firefox

After receiving JSON data from the server via AJAX, I proceeded to evaluate it as follows:

request.responseText=[{name:xxx},{name:yyy},{name:zzz}].

I then used the following code snippet:

var data=eval(request.responseText);

alert(data.length);

Surprisingly, in Internet Explorer the length returned was "4", while in Firefox it was "3".

Upon further investigation using the IE debugger, I discovered that the elements in the 'data' object appeared as follows:

[Methods]
[0]
[1]
[2]

This structure resulted in a length of 4. Curious as to why this discrepancy occurred?

Answer №1

It seems the server may have sent back some data with an unnecessary trailing comma, like this:

[1, 2, 3, ]

This could cause different interpretations in various browsers: IE might see the array as having a length of 4, whereas other more compliant browsers would recognize it as having a length of 3.

Answer №2

[Procedures] serves as a distinct entity highlighted by the debugger to distinguish functions from other data.
This concept does not physically manifest within the object.

In the scenario where an array consists of three elements labeled 0, 1, and 2, its size shall amount to 3.

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