Why is Javascript printing an array correctly but when I try to specify a key in the array that is clearly there, it says it's undefined?

Question

So the array prints to the console like below when I do console.log(results) but when I do console.log(results[0]) it returns undefined and when I do console.log(results['length']) it returns 0 when it is clearly labeled as 27 (i've removed lines to fit the character limit). I don't get what I'm doing wrong, any help would be appreciated. You can see my code for printing it from Ajax below too, this is formatted like this purely for testing and won't be like this once I can sort out the issue. Also the Ajax prints Song List: when I just have results after 'q=' so the values aren't going through the Ajax at all. I've tried with and without doing JSON.stringify on the values in the array, they currently are stringified below.

Array:

[]
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...
    length: 27
    __proto__: Array(0)

Ajax:

$(document).ready(function(){
    $.ajax({
        type: 'POST',
        data: 'q=' + console.log(results) + console.log(results[0]),
        success: function(songs){
            $('#response').text('Song List: ' + songs);
        }
    });
});

Why are you trying to use console.log in a string concatenation context!?! — CBroe, Sep 08 '20 at 09:34
See the linked question's answers for details, but what's happening is that the array is empty as of the `console.log(results)` statement executing (which is why `results[0]` is `undefined`). But the console keeps a live reference to the array, and later when you expand the array in the console, it shows you its contents **then**. You're trying to use the array before it's been filled in. — T.J. Crowder, Sep 08 '20 at 09:36

Why is Javascript printing an array correctly but when I try to specify a key in the array that is clearly there, it says it's undefined?

0 Answers0