hi! i'm trying to template with selmer ... i'm not sure how to do a for loop on a vector of maps i have...

I get something like "VALUE is {:lesson-number 0, :lesson-name "", :lesson-parts ["Lesson 0 Objectives" "Particles"

(defn html-lesson-array-bits [section]
 (sp/render 
 "{% for lesson in lessons %}
 		VALUE is {{lesson}}
 	{% endfor %}" 
  {:lessons @jc-lessons-array-s1}))

jc-lessons array looks like

(def jc-lessons-array-s1 (atom 						 [{:lesson-number 0							 	 :lesson-name ""						 	  :lesson-parts ["Lesson 0 Objectives" 			 	  															"Particles Introduction に　で　を が"			 	  															"Intro to Katakana and Kanji"  															"Kanji and Creative Memory"]	 :lesson-kanji #{} 				 	 :lesson-grammar #{"ni-time" "de-setting" "wo-directobj" "ga-subject"}					 	 :lesson-verbs #{} }					 	{:lesson-number 1				 		:lesson-name ""	 	  :lesson-parts ["Lesson 1 Objectives"  	  															"Particles: に　で　を" 

(vector of maps)

i tried adding selmer filters like

(selmer.filters/add-filter! :key key)
(selmer.filters/add-filter! :val val)

and trying to invoke by

VALUE is {{lesson|val}}

but the error is On filter body 'lesson|val' and filter 'val' this error occurred:clojure.lang.PersistentArrayMap cannot be cast to java.util.Map$Entry

just invoking {{lesson}} in the for statement brings back the whole map, how can i grab one particular key-val out of the map with selmer?

is a for loop the best way?

Oh I see

I was making it very hard

selmer can do keys just use dot indexing

{{lesson.lesson-number}}

solved

is there anything in clojure like collection.Count(x => x > 2) ? or the only way to do it would be to

(count (filter #(> % 2) col))

That isn't the only way, but it is one of the most concise ways to write code that does that.

I mean, you'd want to put the collection as the second arg to the filter call, of course, and balance the parens.

what does collection.Count(x => x > 2) do? i'm not familiar with that from linq

ah, i wasn't aware that they had an extension method taking a predicate

(defn count-matching [pred coll]
  (count (filter pred coll)))

@andy.fingerhut thanks, fixed the code for future reference. @dpsutton interesting... thanks ! 🙂

I'm lost 😞. I need to make several validations and add the result (result is a string) of each validation to a collection. What I did:

((juxt #(func a) #(func b) #(*func c*)) pa pb *pc*) 

@marcio.akk You can wrap the call in (fn [_ _ pc] (func-c pc))

Hi, I am having trouble working with big numbers (bigint/long), I am working through the http://exercism.io exercices and I am trying to do the armstrong problem Here are 2 examples of how I am trying to solve it, but I never get the right results, and I don’t understand why:

(def a (str/split (str 21897142587612075) #""))
(long (reduce +' (map #(Math/pow (Integer/parseInt %) (count a)) a)))
=> 21897142587612072
(reduce + (map #(long (Math/pow (Integer/parseInt %) (count a))) a))
=> 21897142587612074

Hello Clojurians! What is your favorite clojure library / framework to write microservices? A quick google search pointed me to luminus, but are there other options? I am fairly inexperience with any web programming, I have only used python's flask?

For web, there are almost too many options! You can't really go wrong with luminus, though it's worth knowing that there are other libraries available.

Yeah, Luminus is a great piece, especially for the concise and very spot-on documentation.