cftbat-code/07/code.clj at 2aaaa6c6e745f797d7d86ca477db80b96b437f68 · braveclojure/cftbat-code · GitHub

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(defmacro backwards
  [form]
  (reverse form))

(backwards (" backwards" " am" "I" str))
; => "I am backwards"


(def addition-list (list + 1 2))
(eval addition-list)
; => 3

(eval (concat addition-list [10]))
; => 13

(eval (list 'def 'lucky-number (concat addition-list [10])))
; => #'user/lucky-number

lucky-number
; => 13


(str "To understand what recursion is," " you must first understand recursion.")
"To understand what recursion is, you must first understand recursion."

(read-string "(+ 1 2)")
; => (+ 1 2)

(list? (read-string "(+ 1 2)"))
; => true

(conj (read-string "(+ 1 2)") :zagglewag)
; => (:zagglewag + 1 2)


(eval (read-string "(+ 1 2)"))
; => 3

(#(+ 1 %) 3)
; => 4

(read-string "#(+ 1 %)")
; => (fn* [p1__423#] (+ 1 p1__423#))

(read-string "'(a b c)")
; => (quote (a b c))

(read-string "@var")
; => (clojure.core/deref var)

(read-string "; ignore!\n(+ 1 2)")
; => (+ 1 2)

true
; => true

false
; => false

{}
; => {}

:huzzah
; => :huzzah

()
; => ()

(if true :a :b)
; => :a

if
; => CompilerException java.lang.RuntimeException: Unable to resolve symbol: if in this context, compiling:(NO_SOURCE_PATH:0:0)

(let [x 5]
  (+ x 3))
; => 8

(def x 15)
(+ x 3)
; => 18

(def x 15)
(let [x 5]
  (+ x 3))
; => 8

(let [x 5]
  (let [x 6]
    (+ x 3)))
; => 9

(defn exclaim
  [exclamation]
  (str exclamation "!"))

(exclaim "Hadoken")
; => "Hadoken!"

(map inc [1 2 3])
; => (2 3 4)

(read-string "+")
; => +

(type (read-string "+"))
; => clojure.lang.Symbol

(list (read-string "+") 1 2)
; => (+ 1 2)

(eval (list (read-string "+") 1 2))
; => 3

(eval (read-string "()"))
; => ()

(+ 1 2)
; => 3

(+ 1 (+ 2 3))
; => 6

(if true 1 2)
; => 1

'(a b c)

(quote (a b c))

(read-string "(1 + 1)")
; => (1 + 1)

(eval (read-string "(1 + 1)"))
; => ClassCastException java.lang.Long cannot be cast to clojure.lang.IFn

(let [infix (read-string "(1 + 1)")]
  (list (second infix) (first infix) (last infix)))
; => (+ 1 1)

(eval
 (let [infix (read-string "(1 + 1)")]
   (list (second infix) (first infix) (last infix))))
; => 2

(defmacro ignore-last-operand
  [function-call]
  (butlast function-call))

(ignore-last-operand (+ 1 2 10))
; => 3

;; This will not print anything
(ignore-last-operand (+ 1 2 (println "look at me!!!")))
; => 3

(macroexpand '(ignore-last-operand (+ 1 2 10)))
; => (+ 1 2)

(macroexpand '(ignore-last-operand (+ 1 2 (println "look at me!!!"))))
; => (+ 1 2)

(defmacro infix
  [infixed]
  (list (second infixed)
        (first infixed)
        (last infixed)))

(infix (1 + 2))
; => 3

(defn read-resource
  "Read a resource into a string"
  [path]
  (read-string (slurp (clojure.java.io/resource path))))

(defn read-resource
  [path]
  (-> path
      clojure.java.io/resource
      slurp
      read-string))