JavaScript Weirdness

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Okay, in case you didn't know already, Javascript is a funky language.

I am currently working on a simple calendar web app using CSS Grid and a bit of react, so I wanted to generate an array of arrays storing the days in each month in each year. I was hoping to do this with some fancy forEach loops so I started with the following code:

const year = new Array(12).fill([]);

I was hoping this would return something like this:

year = [[], [], [], [], [], [], [],