What is going on in this picture? Doesn't seem to make sense

So I’m looking over a tutorial on a basic inventory system. The picture below is directly from that tutorial. What I’m not understanding - look at the variables. How is it that they’re set to array values but have single default value?. Also, when I set a variable to array both the icon to the right and left change, but not in this picture? What am I missing here. Ill include a link to the tutorial below the image.

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Ah. I suspected that something of that sort might have been the case but was unsure

You’re only missing the fact that the tutorial is 2-3 years old. So many things have changed…

yup thats how things used to be, you had to compile to make a variable into an array if i remember right.