noahlz

Free excerpt from TypeSafe (pdf): Scala for the Impatient

Class Setters

I discovered the special syntax for a field setter:

class Person {
  private var privateAge = 0 // Make private and rename
  def age = privateAge
 def age_ = (newValue: Int) {

mgodave

from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
from zipfile import ZipFile
from string import join
import os
import re

def getMavenCoordinates(elements):
    return dict(zip(('group', 'artifact', 'version'), elements))
    
def getMavenArtifactName(coordinates):

qtrfeast

Check out README.md to get started editing Clojure with Emacs.

wjlroe

(defn method-spy
  "Print out reflection info about a method."
  [classname methodname]
  (let [c (Class/forName classname)
        all-methods (.getDeclaredMethods c)
        matching-methods (filter #(= methodname (.getName %)) all-methods)
        pr-col (fn [name info] (println (format "%24s: %s" name info)))]
    (doseq [m matching-methods]
      (println (.toGenericString m))
      (pr-col "ReturnType" (.getReturnType m))

stuarthalloway

;; Datomic example code
(use '[datomic.api :only (db q) :as d])

;; ?answer binds a scalar
(q '[:find ?answer :in ?answer]
   42)

;; of course you can bind more than one of anything
(q '[:find ?last ?first :in ?last ?first]
   "Doe" "John")

noahlz

;; See: http://codereview.stackexchange.com/q/6682/9032
(defn map-invert-preserve-dups [m]
  (apply merge-with into
         (for [[k v] m]
           {v [k]})))

(->> "http://www.weeklyscript.com/Pulp%20Fiction.txt" 
   (slurp)
   (re-seq #"\w{5,}")
   (frequencies)

noahlz

(defn any-pair-make-sum? [arr target]
  (let [m (frequencies arr)]
    (loop [f (first arr)
           x (- target f)
           r (rest arr)]
     (let [entry (find m x)
           only-needs-one-count (not (= x f))]
       (if (and entry (or only-needs-one-count (> 1 (val entry))))
         true
         (if (empty? r)

noahlz

; SLIME
user> 
user> (load-file "c:/projects/github/fix-clj/src/fix_clj/core.clj")
#'fix-clj.core/next-value-and-rest
user> (load-file "c:/projects/github/fix-clj/test/fix_clj/test_core.clj")
nil
user> (use ['fix-clj.core 'fix-clj.test_core] :reload-all :verbose)
; Evaluation aborted.
user> (use '[fix-clj.core fix-clj.test_core] :reload-all :verbose)
; Evaluation aborted.

ericacm

Scala Links

Eric Pederson

• [email protected]
• Blog
• LinkedIn
• Twitter
• StackOverflow
• GitHub

jasonrudolph

Programming Achievements: How to Level Up as a Developer

This gist is part of a blog post. Check it out at:

http://jasonrudolph.com/blog/2011/08/09/programming-achievements-how-to-level-up-as-a-developer