This should be a very simple task, but for some reason I´m not seeing my mistake. I´m sorry if it is too obvious.
I have created an Array with multiple items inside it (it is the first log in the picture). Some of this items are Arrays. I want to retrieve the first item from the first array. It should be quite simple. The name of my Array is boardAsArray, so I should just type:
boardAsArray[1][0];
And since the second item of this array is an Array, I should get the first item of the array inside of the array. But this is not what´s happening.
Here is the picture of the logs:

Here is what I´ve asked the code to log (in this order):
Logger.log(boardAsArray);
Logger.log(boardAsArray[1]);
Logger.log(boardAsArray[1][0]);
Logger.log(boardAsArray[1][1]);
Logger.log(boardAsArray[1][2]);
Logger.log(boardAsArray[1][3]);
Logger.log(boardAsArray[1][4]);
Logger.log(boardAsArray[1][5]);
Logger.log(boardAsArray[1][6]);
As you can see in the picture. Instead of getting the first item of the first array, the code is logging the first array apparently as a string.
How do I fix this? What am I doing wrong?
I´m really sorry if this question is not very clear, but here is the thing. I´m don´t really understand what´s going on. It is so messy that I can´t even explain it...
Given this array (the first log in the picture):
Logger.log(boardAsArray[1][0])
// Should be 6 and not [
Sorry again for the confusion. And thank you very much for your help.