first vals first vals

[Zhemin Lin]

Hi.

I'm quite annoyed by the ugly smell of (first (vals (first ... )).  Is there any better way to do it?

user=> (-> {:key1 {:cf {:cq "0,1,2,3"}}} vals first vals first vals first (clojure.string/split #","))

["0" "1" "2" "3"]

Thanks a lot!

[Jernau]

You could use get-in:

(-> {:key1 {:cf {:cq "0,1,2,3"}}}

    (get-in [:key1 :cf :cq]))

Cheers, 

James

[John Szakmeister]

I think you want get-in:

(-> {:key1 {:cf {:cq "0,1,2,3"}}}

(get-in [:key1 :cf :cq])
(clojure.string/split #","))

-John

[Zhemin Lin]

Thanks, John & Jernau.

What if :cf, :cq are not fixed, and I don't really care about the keys, but only the value of the value of the value ...?

Thanks,

Zhemin.

[John Szakmeister]

You might want to consider tree-seq to get at the innermost string:

(last (tree-seq map? vals
{:key1 {:cf {:cq "0,1,2,3"}}}))

-John

[Zhemin Lin]

Wow, that's really cool!

Thanks a lot, John!

[John D. Hume]

On Nov 21, 2013 3:32 AM, "Zhemin Lin" <lin.z...@gmail.com> wrote:
> What if :cf, :cq are not fixed, and I don't really care about the keys, but only the value of the value of the value ...?

Maps seem an awkward choice of data-structure for a scenario where you don't know or care about the keys.

[林哲民 (Lin Zhemin)]

Clojure-hbase returns {rowkey {:cf {:cq value }}} and its a trade-off not to write it in hbase API.

2013/11/21 21:24 "John D. Hume" <duelin....@gmail.com>:

On Nov 21, 2013 3:32 AM, "Zhemin Lin" <lin.z...@gmail.com> wrote:
> What if :cf, :cq are not fixed, and I don't really care about the keys, but only the value of the value of the value ...?

Maps seem an awkward choice of data-structure for a scenario where you don't know or care about the keys.

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