Re: Creating map from string
Ok, those sugggestions work great. Thanks for the help. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Creating map from string
On Sun, Mar 18, 2012 at 21:04, Jimmy jimmy.co...@gmail.com wrote:
Hi,
I would like to generate a hashmap from a string. The key portions of
the string will have some a prefix such as @ to define that they are
a key. So the following string
@key1 this is a value @another-key and another value @test1 and
other value
would get converted to.
{ :@key1 this is a value, :@another-key and another
value , :@test1 and other value}
What's the best way to do this?
Thanks,
Jimmy
Things to think about when designing an ad-hoc format:
- How are you handling white space?
Your example seems to indicate that any amount of white space is
allowed and ignored between key and value or value and key, but white
space internal to the value is preserved. I suppose keys will never
contain white space since that's not expressible as the first bit of
white space following the key marks the transition to value.
- Values can't be empty, consist of, start with or end with white space.
- Values can't contain @ unless you provide some kind of escaping convention.
// Ben
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Creating map from string
Hi,
I would like to generate a hashmap from a string. The key portions of
the string will have some a prefix such as @ to define that they are
a key. So the following string
@key1 this is a value @another-key and another value @test1 and
other value
would get converted to.
{ :@key1 this is a value, :@another-key and another
value , :@test1 and other value}
What's the best way to do this?
Thanks,
Jimmy
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Re: Creating map from string
You could use a regexp to pick out the key and the value - something like
this:
(into {}
(map (fn [[_ x y]] [(keyword x) (clojure.string/trim y)])
(re-seq #(@[^ ]*) *([^@]*) s)))
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Re: Creating map from string
On Sun, Mar 18, 2012 at 21:14, David Powell djpow...@djpowell.net wrote:
(into {}
(map (fn [[_ x y]] [(keyword x) (clojure.string/trim y)])
(re-seq #(@[^ ]*) *([^@]*) s)))
I think `for' is cleaner than map + anonymous function:
(into {}
(for [[_ k v] (re-seq #(@[^ ]*) *([^@]*) s)]
[(keyword k) (clojure.string/trim v)]))
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Re: Creating map from string
argh i come back to paste in my answer and you beat me to it :(
i was gonna say:
(let [s @key1 this is a value @another-key and another value
@test1 and other value]
(reduce (fn [m [_ k v]] (assoc m k (string/trim v))) {} (re-seq
#(@[\w-]+)([^@]*) s)))
much the same...
On Sun, Mar 18, 2012 at 3:14 PM, David Powell djpow...@djpowell.net wrote:
You could use a regexp to pick out the key and the value - something like
this:
(into {}
(map (fn [[_ x y]] [(keyword x) (clojure.string/trim y)])
(re-seq #(@[^ ]*) *([^@]*) s)))
--
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Re: into map with vectors versus lists (Re: Creating map from string)
Did you try this
(apply hash-map (partition 2 (split (slurp data) #,)))
On Sat, Dec 4, 2010 at 11:12 AM, Remco van 't Veer rwvtv...@gmail.comwrote:
I expected this to work:
(into {} (partition 2 (split (slurp data) #,)))
But unfortunately, `into' doesn't seem to allow pushing lists of pairs
into a map. But vectors are allowed:
(into {} (map vec (partition 2 (split (slurp data) #,
Can somebody explain why vectors are allowed and lists not?
On 2010/12/03 15:40, Laurent PETIT wrote:
Hi,
2010/12/3 Anclj anb...@gmail.com
Hi,
I have a string of data and I would like to get a map {:key
value, :key value, …}
How could I do that?
I've got:
user (split (slurp data) #,)
[0 2 1 5 2 8 3 15 4 9]
And I would like:
{:0 2, :1 5, :2 8, :3 15, :4 9}
Any idea?
(let [s (split (slurp data) #,)]
(zipmap (take-nth 2 s) (take-nth 2 (rest s
HTH,
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Re: Creating map from string
Thanks a lot for all the answers :)
I've been busy trying to understand all the scripts that you posted.
The code works but I also wanted to know why.
I'm new to Clojure and it's hard for me to understand advanced code,
but looking through the docs and the api I'm learning a lot.
Cheers!
On 4 Des, 23:16, Tyler Perkins thinks.outs...@gmail.com wrote:
Or, better yet,
(into {}
(- (str { (slurp data) })
read-string
(map (fn [[k v]] [(keyword (str k)) v]
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into map with vectors versus lists (Re: Creating map from string)
I expected this to work:
(into {} (partition 2 (split (slurp data) #,)))
But unfortunately, `into' doesn't seem to allow pushing lists of pairs
into a map. But vectors are allowed:
(into {} (map vec (partition 2 (split (slurp data) #,
Can somebody explain why vectors are allowed and lists not?
On 2010/12/03 15:40, Laurent PETIT wrote:
Hi,
2010/12/3 Anclj anb...@gmail.com
Hi,
I have a string of data and I would like to get a map {:key
value, :key value, …}
How could I do that?
I've got:
user (split (slurp data) #,)
[0 2 1 5 2 8 3 15 4 9]
And I would like:
{:0 2, :1 5, :2 8, :3 15, :4 9}
Any idea?
(let [s (split (slurp data) #,)]
(zipmap (take-nth 2 s) (take-nth 2 (rest s
HTH,
--
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Re: Creating map from string
How about just (apply hash-map (split (slurp data) #,)) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Creating map from string
Using 'apply hash-map' doesn't handle the transformations. Note the original post requested keywords for keys and integers for vals in the output. On Dec 4, 11:49 am, Tyler Perkins thinks.outs...@gmail.com wrote: How about just (apply hash-map (split (slurp data) #,)) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Creating map from string
On Dec 4, 12:21 pm, Tim Robinson tim.blacks...@gmail.com wrote:
Using 'apply hash-map' doesn't handle the transformations.
Note the original post requested keywords for keys and integers for
vals in the output.
I'm not the only one who overlooked that! :o) Might just as well use
strings as keys. But OK, try this:
(apply hash-map
(- (str { (slurp data) })
read-string
(map (fn [[k v]] [(keyword (str k)) v]))
flatten))
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Re: Creating map from string
Or, better yet,
(into {}
(- (str { (slurp data) })
read-string
(map (fn [[k v]] [(keyword (str k)) v]
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Creating map from string
Hi,
I have a string of data and I would like to get a map {:key
value, :key value, …}
How could I do that?
I've got:
user (split (slurp data) #,)
[0 2 1 5 2 8 3 15 4 9]
And I would like:
{:0 2, :1 5, :2 8, :3 15, :4 9}
Any idea?
Thanks.
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Re: Creating map from string
Hi,
2010/12/3 Anclj anb...@gmail.com
Hi,
I have a string of data and I would like to get a map {:key
value, :key value, …}
How could I do that?
I've got:
user (split (slurp data) #,)
[0 2 1 5 2 8 3 15 4 9]
And I would like:
{:0 2, :1 5, :2 8, :3 15, :4 9}
Any idea?
(let [s (split (slurp data) #,)]
(zipmap (take-nth 2 s) (take-nth 2 (rest s
HTH,
--
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Re: Creating map from string
Here is what I came up with ...
(let [d (split (slurp data) #,)]
(- d
(apply hash-map)
(clojure.walk/keywordize-keys)
(clojure.contrib.generic.functor/fmap read-string)))
Sunil.
On Fri, Dec 3, 2010 at 7:52 PM, Anclj anb...@gmail.com wrote:
Hi,
I have a string of data and I would like to get a map {:key
value, :key value, …}
How could I do that?
I've got:
user (split (slurp data) #,)
[0 2 1 5 2 8 3 15 4 9]
And I would like:
{:0 2, :1 5, :2 8, :3 15, :4 9}
Any idea?
Thanks.
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Re: Creating map from string
2010/12/3 Laurent PETIT laurent.pe...@gmail.com
Hi,
2010/12/3 Anclj anb...@gmail.com
Hi,
I have a string of data and I would like to get a map {:key
value, :key value, …}
How could I do that?
I've got:
user (split (slurp data) #,)
[0 2 1 5 2 8 3 15 4 9]
And I would like:
{:0 2, :1 5, :2 8, :3 15, :4 9}
Any idea?
(let [s (split (slurp data) #,)]
(zipmap (take-nth 2 s) (take-nth 2 (rest s
Sorry, this respects the contract better:
(let [s [1 2 3 4 5 6]]
(zipmap
(map keyword (take-nth 2 s))
(map #(Integer/valueOf %) (take-nth 2 (rest s)
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Re: Creating map from string
On Fri, Dec 3, 2010 at 10:08 AM, Laurent PETIT laurent.pe...@gmail.com wrote:
2010/12/3 Laurent PETIT laurent.pe...@gmail.com
2010/12/3 Anclj anb...@gmail.com
I've got:
user (split (slurp data) #,)
[0 2 1 5 2 8 3 15 4 9]
And I would like:
{:0 2, :1 5, :2 8, :3 15, :4 9}
Any idea?
(let [s (split (slurp data) #,)]
(zipmap (take-nth 2 s) (take-nth 2 (rest s
Sorry, this respects the contract better:
(let [s [1 2 3 4 5 6]]
(zipmap
(map keyword (take-nth 2 s))
(map #(Integer/valueOf %) (take-nth 2 (rest s)
Both of these traverse s twice. How about:
(let [s (split (slurp data) #,)]
(into {}
(map (fn [[k v]] [(keyword (str k)) v])
(partition 2 s
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Re: Creating map from string
2010/12/3 Ken Wesson kwess...@gmail.com
On Fri, Dec 3, 2010 at 10:08 AM, Laurent PETIT laurent.pe...@gmail.com
wrote:
2010/12/3 Laurent PETIT laurent.pe...@gmail.com
2010/12/3 Anclj anb...@gmail.com
I've got:
user (split (slurp data) #,)
[0 2 1 5 2 8 3 15 4 9]
And I would like:
{:0 2, :1 5, :2 8, :3 15, :4 9}
Any idea?
(let [s (split (slurp data) #,)]
(zipmap (take-nth 2 s) (take-nth 2 (rest s
Sorry, this respects the contract better:
(let [s [1 2 3 4 5 6]]
(zipmap
(map keyword (take-nth 2 s))
(map #(Integer/valueOf %) (take-nth 2 (rest s)
Both of these traverse s twice. How about:
(let [s (split (slurp data) #,)]
(into {}
(map (fn [[k v]] [(keyword (str k)) v])
(partition 2 s
Indeed, if I analyze my solution: the 2 take-nth traverse s 2 times
(creating 2 x 1/2 x n ISeq instances), and the two maps over the 2 resulting
seq traverse these resulting seqs also, creating again 2 x 1/2 x n ISeq
instances).
In the end, 2 x 1/2 x n + 2 x 1/2 x n = 2 x n ISeq instances are created and
visited.
Now yours :-) : (partition 2 s) traverses s once, and creates 1/2 n ISeq
instances each made of a seq of 2 ISeq instances = 1/2 n x 2 = n ISeq
instances.
Then map is applied and creates 1/2 x n vectors in 1/2 x n ISeq instances =
also n instances created.
In the end, your solution also creates 2 x n instances (ISeq instances and
vector instances), before being consumed by into.
In fact, when one knows the algorithm needs to consume the entire seq *by
definition* (since in clojure datastructures themselves are not lazy, only
seqs are), it sometimes feels odd to create all these intermediate objects.
But I generally resist the temptation to too quickly resort to using loop,
which is the real solution to not create too many intermediate objects:
(let [s [1 2 3 4 5 6 7 8]]
(loop [s (seq s) m {}]
(if s
(recur (nnext s) (assoc m (keyword (first s)) (Integer/valueOf (fnext
s
m)))
or else by leveraging transients:
(let [s [1 2 3 4 5 6 7 8]]
(loop [s (seq s) m (transient {})]
(if s
(recur (nnext s) (assoc! m (keyword (first s)) (Integer/valueOf (fnext
s
(persistent! m
But really I generally not start (anymore) writing loops unless I see a
performance problem!
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Re: Creating map from string
Object creation wasn't my concern -- modern JVMs are very efficient in that regard -- just traversals. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Creating map from string
2010/12/3 Ken Wesson kwess...@gmail.com Object creation wasn't my concern -- modern JVMs are very efficient in that regard -- just traversals. Ken, I've done my homework, and of course you were right, and me wrong. At some point in my reasoning I've conflated number of object allocations with number of traversals, and I was off track. Cheers, -- Laurent -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
