The document outlines the agenda for a ClojureBridge event in Helsinki. The agenda includes introductions and goals in the morning, followed by programming exercises on basic Clojure concepts like functions, data structures, and more programming in the afternoon, concluding in the evening. The document provides examples of Clojure code for numbers, strings, keywords, booleans, vectors, and functions to demonstrate concepts covered in the workshop.

1. ClojureBridge Helsinki
17.05.2015

2. Tervetuloa

3. @SolitaOy @metosin

4. Agenda

5. 10:00
13:00
15:00
17:00
Welcome
Our goals
First steps in programming
Lunch
Programming in real life
More programming
Break
Even more programming
We're done
Agenda

6. Our goals

7. (+ 3 4)
(max 8 17 2)
(eat "sandwich")

8. ;; more food code
(eat "cookie") ; nom nom nom
(eat "donut") ; mmm donuts

9. (+ 1 1) ;=> 1 + 1 = 2
(- 12 4) ;=> 12 - 4 = 8
(* 13 2) ;=> 13 * 2 = 26
(/ 27 9) ;=> 27 / 9 = 3

10. Infix:
Prefix:
1 + 2 * 3 / 4 + 5 - 6 * 7 / 8 + 9
(+ (- (+ (+ 1 (/ (* 2 3) 4)) 5) (/ (* 6 7) 8)) 9)

11. Infix:
Prefix:
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
(+ 1 2 3 4 5 6 7 8 9)
Infix:
Prefix:
1 + 2 * 3 / 4 + 5 - 6 * 7 / 8 + 9
(+ (- (+ (+ 1 (/ (* 2 3) 4)) 5) (/ (* 6 7) 8)) 9)

12. Open terminal
Open LightTable
File -> Open folder -> clojurebridge

13. (+ 4/3 7/8) ;=> 53/24
(- 9 4.2 1/2) ;=> 4.3
(/ 27/2 1.5) ;=> 9.0

14. ;; strings
"Salut tout le monde"
"Prost!"
;; keywords
:surname
:birth-date
:r2
;; booleans
true
false

15. (def mangoes 3)
(def oranges 5)
(+ mangoes oranges) ;=> 8
(def fruit (+ mangoes oranges))
(def average-fruit-amount (/ fruit 2))
average-fruit-amount ;=> 4

16. Excercise
• Define a symbol with value of your height
in centimetres
• Define another symbol that holds your
height in inches
• Ask height of your neighbours and
calculate the average of all heights
One inch is 2.54 centimetres
Average: sum of values divided by number of values

17. Data-structures

19. ["a" "b" "c" "d" "e" "f"]["a" "b" "c" "d" "e" "f"]
[1 2 3 4]
["Answer" 42]
[]
[[1 2 3] ["a" "b" "c"]]

20. (count [5 10 15]) ;=> 3
(nth [5 10 15] 1) ;=> 10
(first [5 10 15]) ;=> 5
(rest [5 10 15]) ;=> (10 15)
(conj [5 10] 15) ;=> [5 10 15]

21. Excercise
• Define a vector containing the temperatures
of your home town for next 5 days
• Use nth function to check the temperature
in Tuesday
For example: http://ilmatieteenlaitos.fi

22. Functions

23. (defn reduced-price [price]
(* price 0.75))
(reduced-price 120) ;=> 90
(reduced-price 10) ;=> 7.5
(reduced-price 0) ;=> 0.0

24. (defn reduced-price [price]
(* price 0.75))
(reduced-price 120) ;=> 90
(reduced-price 10) ;=> 7.5
(reduced-price 0) ;=> 0.0
(defn reduced-price [price reduce-by]
(* price reduce-by))
(reduced-price 120 0.75) ;=> 90.0
(reduced-price 120 0.50) ;=> 60.0

25. (defn reduced-price [price reduce-by]
(* price reduce-by))
(reduced-price 120 0.75) ;=> 90.0
(reduced-price 120 0.50) ;=> 60.0

26. (defn reduced-price [price reduce-pct]
(* price (- 1.0 (/ reduce-pct 100.0))))
(reduced-price 120 25) ;=> 90.0
(reduced-price 120 50) ;=> 60.0
(defn reduced-price [price reduce-by]
(* price reduce-by))
(reduced-price 120 0.75) ;=> 90.0
(reduced-price 120 0.50) ;=> 60.0

27. (defn reduced-price [price reduce-pct]
(* price (- 1.0 (/ reduce-pct 100.0))))
(reduced-price 120 25) ;=> 90.0
(reduced-price 120 50) ;=> 60.0

28. (defn reduced-price [price reduce-pct]
(let [one-percent (/ price 100.0)
discount (* one-percent reduce-pct)]
(- price discount)))
(defn reduced-price [price reduce-pct]
(* price (- 1.0 (/ reduce-pct 100.0))))
(reduced-price 120 25) ;=> 90.0
(reduced-price 120 50) ;=> 60.0

29. (defn reduced-price [price reduce-pct]
(let [one-percent (/ price 100.0)
discount (* one-percent reduce-pct)]
(- price discount)))

30. (defn reduced-price [price reduce-pct]
(let [one-percent (/ price 100.0)
discount (* one-percent reduce-pct)]
(- price discount)))
(defn major-sale [price]
(reduced-price price 40))
(map major-sale [120.0 100.0 30.0])
;=> (72.0 60.0 18.0)