How to create multiple agents in parallel (for? or map?) with name and values in CLOJURE?

Question

I'm trying to make a bunch of agents. Individually, one can do:

(def myAgent (agent 3))

But if I want to make a lot of agents, how can I assign both names and values to the agent in an anonymous function? I have this:

(def agents (vec (map agent (range 0 50)) ))

Which makes 50 agents, but none of them have a value. When I try an anonymous function:

(def agents (vec (map (fn [x] (def x (agent 3)) (range 0 50)) ))

It doesn't work. Any help would be greatly appreciated.

"makes 50 agents, but none of them have a value" - everything in clojure has a value — noisesmith
– noisesmith, Commented Oct 9, 2015 at 6:06
Ok, well, i'm very amateur with clojure, but wracking my brain trying to figure this out, and it is not anywhere online, at least that I can find. Isn't that what this place is for? Why down-vote and not help? — ProGrammar
– ProGrammar, Commented Oct 9, 2015 at 6:08
@ProgrammingEqualsSuperpower you must supply initial value when creating agent. you cannot create agent just by doing (agent) — mavbozo
– mavbozo, Commented Oct 9, 2015 at 6:17
I don't understand what the accepted answer does that the supposedly not working code here doesn't (other than being a hash map vs. a vector, both are indexed by numeric key, both contain agents, the agents in both cases are initialized to some starting value). I have no idea what the code in your question fails to do that you need. — noisesmith
– noisesmith, Commented Oct 9, 2015 at 6:33
So, I wrote it wrong. When I do the above, corrected, (def agents (vec (map (fn [x] (def x (agent 3)) (range 0 50)) )) It gives me a vector of 50 agents containing the value 3, but they're all assigned to x, and not the unique numbers I was tying to have x represent. — ProGrammar
– ProGrammar, Commented Oct 9, 2015 at 15:55

mavbozo · Accepted Answer · 2015-10-09 06:13:48Z

creates a map containing 3 agents whose names are the map keys 0, 1, 2 and the map values are the agents with initial value :initial-value

user=> (zipmap (range 3) (repeatedly #(agent :initial-value))) {0 #object[clojure.lang.Agent 0x31edaa7d {:status :ready, :val :initial-value}], 1 #object[clojure.lang.Agent 0x26adfd2d {:status :ready, :val :initial-value}], 2 #object[clojure.lang.Agent 0x3336e6b6 {:status :ready, :val :initial-value}]}

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