thieux

(defn naive-fibonacci [n] 
  (condp = n
    0 1
    1 1
    (+ (naive-fibonacci (- n 1)) 
       (naive-fibonacci (- n 2)))))

(defn fibonacci-draft
  ([n]
   (fibonacci-draft n 0 1))

thieux

(ns fourclojure.problem)

(comment Maximum Value 38)

(defn max-of [& positive-numbers]
  (let [max-acc
        (fn [ns acc] 
          (if (empty? ns) 
            acc 
            (recur (rest ns) (if (> (first ns) acc) (first ns) acc))))]

thieux

import org.junit.Test;

public class ArrayCovarianceTest {

	@Test(expected = ArrayStoreException.class)
	public void cat_should_not_be_set_in_dog_list() {
		Animal[] animals = new Dog[1]; // array covariance

		// Java compiler allows the assignment because Dog extends Animal 
		// But the Java runtime throws a "java.lang.ArrayStoreException: Cat"

thieux

(ns clojure-brave-true-exercises.crashcourse-test
  (:require [clojure.test :refer :all]))

(deftest map-empty
  (testing "empty"
    (is (= #{} (mapset inc [])))))

(defn mapset [f list] #{})

(deftest map-singleton

thieux

; CIDER 0.8.1 (package: 20141120.1746) (Java 1.8.0_111, Clojure 1.8.0, nREPL 0.2.12)
clojure-brave-true-exercises.core> (str nil)
""
clojure-brave-true-exercises.core> (str)
""
clojure-brave-true-exercises.core> (str "hello")
"hello"
clojure-brave-true-exercises.core> (str "A" "B")
"AB"
clojure-brave-true-exercises.core> (str :x :y)

thieux

Chai Assertion Library

Create a workspace so that chai will be visible by node REPL.

~/workspace/test/node-chai$ npm install chai
~/workspace/test/node-chai$ node

Import Chai:

thieux

React Hello World

I prepare an environment with the last version of nodejs.

In /home/m/opensource/react-hello-world/nodepath.bash

#!/bin/bash

PATH="/home/m/node-v6.2.1-linux-x64/bin:$PATH"

thieux

IntelliJ Advanced Shortcuts

Editing

Shift+Enter Ctrl+Alt+Enter

Alt+J

Ctrl+Shift+Down

thieux

package com.mathieupauly.selectionsort;

import org.junit.Test;

import static org.assertj.core.api.Assertions.assertThat;

public class SelectionSortTest {

    private SelectionSort selectionSort = new SelectionSort();

thieux

Method or constructor parameters?

Consider passing parameter through a method:

class Fibo {
  int fibo(int n) {...}
}