Clojure Parameters with Optional Flags -

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What's the best way to implement keywords as an alternative flag for a function? I want to call the function such as: 

  (myfunction 5) (myfunction 6: do-this) (myfunction 3: go-here) (myfunction 2: two-this: what-is) Using defn, I can define a function such as:  
  (myfunction [value and flags] ...)  
 
 But  flag  becomes a list. I can write my own function to search the list, but such a function is not included in the core library, So I think it's idiotic is. 
 
 What I'm using now: 
   (defn flag-set? [List flag] (not (empty? (Filter # (= flag%) list ) (Defn flag-add [list flag] (opposition flag list)) (defn flag delete [list flag] (filter # (not = flag%) list))

Lists (as well as vectors and maps) are not a good option for data structure for value-based lookup (linear time) That clojure.core does not have such functions.

Set via "What is" If it provides a fast value-based lookup, then about 

  (defn foo [value and flags] (let's [flags] (if it's included? Flags: Add-one) (ink value)))

If no more than one flag, then you can use demolition in such a way: 

  (Defn foo [value & amp; [flag]] ...)

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