Generating a flat array from nested for loops in coffeescript

Question

I'm building a 'Deck' class, modeled after a standard deck of playing cards.

What I WANT is an array of 52 cards, with every possible combination of suits and ranks.

What I GET is an array of length 4, each element of which is an array of 13 objects.

CODE:

ranks = [1..13]                                                                                                                       
suits = ["S", "H", "D", "C"]          

cards = ({rank: rank, suit: suit} for rank in ranks for suit in suits)

Now I know that I can get the job done by declaring an empty array and pushing to it with each iteration, but that doesn't seem as elegant as using the return value of the for. (This is a pet project, so just getting it to work is not the only goal.)

What is the elegant solution here? How do I get the for statement to return a flat array of each combination of cards?

Kevin Bray · Accepted Answer · 2014-08-25 02:02:54Z

2

How about:

cards = [].concat ({rank: rank, suit: suit} for rank in ranks for suit in suits)...

answered Aug 25, 2014 at 2:02

Kevin Bray

3661 silver badge5 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Jon Carter Over a year ago

Hm.. that still leaves 'cards' with length 4, on my version of coffeescript.. (v1.7.1)

Jon Carter Over a year ago

Oh, wait.. I didn't notice the '...'. This is interesting. It does work, so thanks for the answer!

Collectives™ on Stack Overflow

Generating a flat array from nested for loops in coffeescript

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related