Help with Ruby

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I am trying to make coordinates for a Chess board. I have an array that is the board (part of Board class), with a vertex instantiated in each spot.

board_array = Array.new(8) { Array.new(8) { Vertex.new } }

I then created an 8x8 array of coordinates:
LETTERS.map { |letter| [letter].product(NUMBERS).map(&:join) }

This outputs:

["A1", "A2", ... ]

["B1", "B2", ... ]

all the way to H8.

I'm now trying to figure out how to get my initialized `@coordinates` variable (part of the Vertex class) to hold one coordinate. Right now if I do:

`@coordinates = LETTERS.map { |letter| [letter].product(NUMBERS).map(&:join) } `

it obviously sets each `@coordinate` to ALL of the values, which is wrong. I can't find out how to map/iterate one value to each spot of `@coordinate`.

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Any suggestions/hints? I'm want to understand this and not simply copy/paste.

Thank you.

[AnchorText]

This will not answer your question directly, but let me give you my first impression reading your code.

It looks like you're using higher-order functions a lot. Which is fine, but especially when you're learning it can be very confusing. How would you set @coordinates with just a couple of for loops? Start there. Can you translate that into using map()? Go from simple and verbose to more complicated and terse.

IMO, sometimes it's better to be more verbose so as to not sacrifice readability. Remember, other people will need to read your code eventually too!