Created
January 9, 2017 15:30
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Notes from the first aarhus.clj meetup and dojo
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| ;; Purpose of aarhus.clj and these meetups | |
| ;;; To get better | |
| ;;; To meet other Clojure peeps in Aarhus/East Jutland | |
| ;; Intro round | |
| ;;; Name, interests, experience with Clojure? | |
| ;; Agenda | |
| ;; Me talking (< 30m) | |
| ;; Purpose of aarhus.clj | |
| ;; Intro round | |
| ;; Introduction to the language | |
| ;; Installing Clojure using Leiningen | |
| ;; Solving the first couple of 4Clojure problems | |
| ;; You hacking! (90m) | |
| ;; Install lein on your machine | |
| ;; Solve some 4Clojure problems | |
| ;; All the time: Hang out and socialise (if you're into that) | |
| ;; --- Introduction to the language --- | |
| ;;; Parentheses! | |
| (+ 1 2) | |
| (+ 1 2 3) | |
| (- 4 3 2) | |
| ;;; Datatypes | |
| nil | |
| 42 | |
| :foo | |
| "bar" | |
| (= 42 1) | |
| (= "foo" "bar") | |
| (= "foo" "foo") | |
| ;;;; Lists | |
| (list 1 2 3) | |
| (list "foo" "bar" "baz") | |
| (conj '(:bar :baz) :foo) | |
| ;;;; Vectors | |
| ["hello" "world" "!"] | |
| (vec (list 1 2 3)) | |
| (vector 4 5 6) | |
| (= (list 1 2 3) [1 2 3]) | |
| (conj [:bar :baz] :foo) | |
| ([1 2 3] 1) | |
| ;;;; Sets | |
| #{1 2 3} | |
| (set '(1 2 3)) | |
| (set '(1 1 2 2 3 3)) | |
| (conj #{:bar :baz} :foo) | |
| (#{1 2 3} 4) | |
| ;;;; Maps | |
| {:a 20, "b" 30} | |
| (hash-map :foo 42, :bar 2) | |
| (conj {:bar 1, :baz 2} [:foo 0]) | |
| ({:foo 42 :bar 10} :foo) | |
| ;;; Built in functions | |
| (first [3 2 1]) | |
| (first #{3 2 1}) | |
| (first {:foo 0, :bar 2}) | |
| (rest [3 2 1]) | |
| ;;; API | |
| ;;;; https://clojure.github.io/clojure/clojure.core-api.html | |
| ;;; Functions | |
| (fn [x] (+ x 2)) | |
| ((fn [x] (+ x 2)) 40) | |
| (map (fn [x] (+ x 2)) '(1 2 3)) | |
| (filter (fn [x] (= (mod x 2) 0)) '(1 2 3 4 5 6)) | |
| ;;; Java interop | |
| (.toUpperCase "hello") |
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