The slave has a bunch of attributes, one of which is the info pertaining to
its master. I initialize a vector slavesinfo but in the doseq, when I try
adding "x" using "conj", nothing happens. What am I doing wrong?
(defn slave-stats []
(let [ computer (get slave-info "computer")
slaves
Nice! :)
Thanks all for help.
On Tuesday, June 17, 2014 9:00:06 PM UTC+2, Thomas Heller wrote:
>
>
>
> On Tuesday, June 17, 2014 8:16:36 PM UTC+2, Hussein B. wrote:
>>
>> Oh, this works
>>
>> (dosync (alter v #(update-in %1 [1] (fnil conj [ ]) %2) 33))
>>
>
> Not sure what %2 or 33 are doing the
On Tuesday, June 17, 2014 8:16:36 PM UTC+2, Hussein B. wrote:
>
> Oh, this works
>
> (dosync (alter v #(update-in %1 [1] (fnil conj [ ]) %2) 33))
>
Not sure what %2 or 33 are doing there but you can skip the #() function,
alter (just like update-in) uses apply internally so you can just use:
Ah, you got there first :)
James
On Tuesday, 17 June 2014 19:20:52 UTC+1, James Henderson wrote:
>
> 'alter' expects your anonymous function to take at least one argument (the
> current value of the ref being altered), whereas you've passed a 0-arg
> function - there's no mention of a '%' so Cl
'alter' expects your anonymous function to take at least one argument (the
current value of the ref being altered), whereas you've passed a 0-arg
function - there's no mention of a '%' so Clojure expands it to:
(fn []
(update-in @v (fnil conj [])))
Indeed, I suspect you want a 2-arg function
Oh, this works
(dosync (alter v #(update-in %1 [1] (fnil conj [ ]) %2) 33))
On Tuesday, June 17, 2014 8:05:10 PM UTC+2, Hussein B. wrote:
>
> Thanks, it works.
>
> In case, my initial map is a ref type
>
> (def m (ref { } ))
>
> Why this isn't working?
>
> (dosync
>
>(alter m #(update-in @v
Thanks, it works.
In case, my initial map is a ref type
(def m (ref { } ))
Why this isn't working?
(dosync
(alter m #(update-in @v [1] (fnil conj [ ])) 11))
On Tuesday, June 17, 2014 7:55:14 PM UTC+2, Mauricio Aldazosa wrote:
>
> For updating the value of a map given a key you can use upd
On 17 June 2014 18:54, Mauricio Aldazosa
wrote:
>
> user> (update-in {} [1] (fnil conj []) 22)
> {1 [22]}
>
Good use of the fnil function! It's one of those functions I always forget
exists.
- James
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Something like this, perhaps:
(assoc m k (conj (m k []) v))
Where m is the map, k is the key, and v is the new value you want to
append. This works because (m k []) will default to [] if the key k isn't
in the map m.
Usually if a key cannot be found, it defaults to nil. If you don't care so
For updating the value of a map given a key you can use update-in:
user> (update-in {1 [11]} [1] conj 22)
{1 [11 22]}
Now, to handle the case when the key is not present, you can use fnil:
user> (update-in {} [1] (fnil conj []) 22)
{1 [22]}
Cheers,
Mauricio
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Please keep in mind that I'm starting from an empty map. So, I'm looking
for an idiomatic Clojure code to achieve my purpose where if the map
doesn't has that specific key, it will create an entry of that key and add
the value to the newly created vector. And if the key exists, then add the
val
Hi,
This is a very basic question, so be patient please! :)
I have an empty map where key is an integer and the value is a vector.
How I can add an element to the vector of a specific key?
For example:
{1 [11]}
Then
{1 [ 11 22]}
Thanks for help and time.
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