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andrewharmellaw / tracing_trace_3.scala
Created December 3, 2015 10:58
foldLeft(2 :: 3 :: Nil, (0 + 1)) (_ + _)
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andrewharmellaw / tracing_trace_2.scala
Last active December 3, 2015 10:58
def foldLeft[A,B](as: List[A], b: B)(f: (B, A) => B): B = as match {
case Nil => b
case h :: t => foldLeft(t, f(b, h))(f)
}
@andrewharmellaw
andrewharmellaw / tracing_trace_1.scala
Created December 3, 2015 10:56
foldLeft(List(1,2,3), 0)(_ + _)
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andrewharmellaw / foldLeft_and_foldRight-The_Meaty_Bits.scala
Created November 16, 2015 20:53
The meaty bits of foldLeft and foldRight
// foldLeft's meaty bit
case Cons(h,t) => foldLeft(t, f(b, h))(f)
// foldRight meaty bit
case Cons(x, xs) => f(x, foldRight(xs, b)(f))
@andrewharmellaw
andrewharmellaw / foldRight_TakeOne_ImplAndSimpleTrace.scala
Last active November 15, 2015 20:42
Implementation and simple trace of a foldRight (from Functional Programming in Scala, chapter 3)
def foldRight[A,B](as: List[A], b: B)(f: (A, B) => B): B =
as match {
case Nil => b
case Cons(x, xs) => f(x, foldRight(xs, b)(f))
}
foldRight(List(1, 2, 3)) ((x,y) => x + y)
foldRight(Cons(1, Cons(2, Cons(3, Nil))), 0) ((x,y) => x + y)
1 + foldRight(Cons(2, Cons(3, Nil)), 0) ((x,y) => x + y)
1 + (2 + foldRight(Cons(3, Nil), 0) ((x,y) => x + y))
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andrewharmellaw / foldLeft_TakeOne_SimpleTrace.scala
Last active November 15, 2015 20:43
Trace of a simple foldLeft
foldLeft(List(1,2,3), 0) (_ + _)
foldLeft(Cons(1, Cons(2, Cons(3, Nil))), 0) (_ + _)
foldLeft(Cons(2, Cons(3, Nil)), (0 + 1)) (_ + _)
foldLeft(Cons(3, Nil), ((0 + 1) + 2)) (_ + _)
foldLeft(Nil, (((0 + 1) + 2) + 3)) (_ + _)
(((0 + 1) + 2) + 3))
@andrewharmellaw
andrewharmellaw / foldLeft_TakeOne.scala
Last active November 15, 2015 20:19
folding_blog_post-gist1
def foldLeft[A,B](as: List[A], b: B)(f: (B, A) => B): B
as match {
case Nil => b
case Cons(h,t) => foldLeft(t, f(b, h))(f)
}
@andrewharmellaw
andrewharmellaw / scalax_2014_slides.md
Last active August 29, 2015 14:11 — forked from wozmir/scalax_2014_slides.md
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andrewharmellaw / pom.xml
Created June 17, 2013 10:42
Example Maven 3.0 POM showing config of various static analysis tools, running in the main build, and stopping it if there are any errors found. Specific tools are: PMD, Checkstyle, CPD, Cobertura, JDepend and Sonar.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<properties>
<pmd.version>3.0.1</pmd.version>
<cobertura.version>2.5.2</cobertura.version>
<checkstyle.version>2.10</checkstyle.version>
<compileSource>1.7</compileSource>
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andrewharmellaw / pom.xml
Last active December 18, 2015 14:19
Maven 3.0 POM showing plugins for running Camel directly, in an embedded Jetty, and deployed to a local tomcat server.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<pakaging>war</packaging>
<properties>
<jetty.version>7.6.10.v20130312</jetty.version>
<compileSource>1.7</compileSource>