Re: Data Transformation Question

[tmountain]

Thanks all. Much appreciated!

On Wednesday, October 12, 2016 at 11:26:09 AM UTC-4, tmountain wrote:
>
> Hi, I'm trying to transform a sequence of data to a map, and I'm using the 
> following pattern.
>
> (def data [ {:id 1, :name "foo"}, {:id 2, :name "bar"}])
>
> (zipmap (map #(:id %) data) data)
>
> ; result: {1 {:id 1, :name "foo"}, 2 {:id 2, :name "bar"}}
>
> Is this the most idiomatic way to accomplish this transformation? If not, 
> what is?
>
> Thanks,
> Travis
>

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RE: Data Transformation Question

[Aaron Cummings]

You may also want to consider clojure.set/index, though that may not exactly be 
what you are looking for. 

 Original message 
From: tmountain <tinymount...@gmail.com> 
Date: 2016/10/12  11:26  (GMT-05:00) 
To: Clojure <clojure@googlegroups.com> 
Subject: Data Transformation Question 

Hi, I'm trying to transform a sequence of data to a map, and I'm using the 
following pattern.
(def data [ {:id 1, :name "foo"}, {:id 2, :name "bar"}])

(zipmap (map #(:id %) data) data)

; result: {1 {:id 1, :name "foo"}, 2 {:id 2, :name "bar"}}
Is this the most idiomatic way to accomplish this transformation? If not, what 
is?
Thanks,Travis



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Re: Data Transformation Question

[Timothy Baldridge]

group-by is slightly different in that it wraps every value in a vector,
and those vectors will contain multiple items if there is an id collision.
So that may be what the OP wanted, but it also is a change in semantics.

I we can simplify the code a bit to (zipmap (map :id data) data) which is
about as simple as you are going to get.

Timothy

On Wed, Oct 12, 2016 at 9:29 AM, lvh <_...@lvh.io> wrote:

>
>
> On Oct 12, 2016, at 10:26 AM, tmountain  wrote:
>
> Hi, I'm trying to transform a sequence of data to a map, and I'm using the
> following pattern.
>
> (def data [ {:id 1, :name "foo"}, {:id 2, :name "bar"}])
>
> (zipmap (map #(:id %) data) data)
>
> ; result: {1 {:id 1, :name "foo"}, 2 {:id 2, :name "bar”}}
>
>
> Consider: (group-by :id data)
>
> Is this the most idiomatic way to accomplish this transformation? If not,
> what is?
>
> Thanks,
> Travis
>
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Data Transformation Question

[tmountain]

Hi, I'm trying to transform a sequence of data to a map, and I'm using the 
following pattern.

(def data [ {:id 1, :name "foo"}, {:id 2, :name "bar"}])

(zipmap (map #(:id %) data) data)

; result: {1 {:id 1, :name "foo"}, 2 {:id 2, :name "bar"}}

Is this the most idiomatic way to accomplish this transformation? If not, 
what is?

Thanks,
Travis

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Re: Data Transformation Question

[lvh]

> On Oct 12, 2016, at 10:26 AM, tmountain  wrote:
> 
> Hi, I'm trying to transform a sequence of data to a map, and I'm using the 
> following pattern.
> 
> (def data [ {:id 1, :name "foo"}, {:id 2, :name "bar"}])
> 
> (zipmap (map #(:id %) data) data)
> 
> ; result: {1 {:id 1, :name "foo"}, 2 {:id 2, :name "bar”}}

Consider: (group-by :id data)

> Is this the most idiomatic way to accomplish this transformation? If not, 
> what is?
> 
> Thanks,
> Travis
> 
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> 
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> .

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