How do I set the key in an each() function?

Question

I am a beginner to jQuery and although it seems like an easy question I just don't seem to have the terminology to look it up on Google - have tried everything...

I am trying to do some Array parsing as a function and have put this thing together by looking it up on the web. I would like it to count the number of objects in an array where the "key" and "item" are the same. I already know that the key is wid and it is called via the key.

function countmeta(array, thekey, item) {
    var count = 0;
    var tkey = 'wid';
    $.each(array, function(i, v) { 
      if (v.thekey == item) 
        count++; 
    });
    return count;
}

If I set it manually it works perfectly:

$.each(array, function(i, v) { 
  if (v.wid == item) 
    count++; 
});

I also tried stuff like

var tkey = 'wid';
var tkey = "wid";

and

var tkey = thekey;
$.each(array, function(i, v) { 
  if (v.tkey == item) 
    count++; 
});

What am I doing wrong? I obviously have a gap in my understanding of what type of variable or string the wid represents in v.wid. Please help.

You need to use bracket notation when attempting to access the key of an object by variable. In this case `v[tkey]`. I would also suggest using the native `filter()` method and returning the length of the resulting array instead of using `$.each()`. It should be faster, doesn't rely on jQuery, and doesn't use an extra variable. — Rory McCrossan, Nov 19 '19 at 09:20

How do I set the key in an each() function?

0 Answers0