| // scala 2.7 simple type constraint. This can only constrain a type parameter of this function. | |
| // Below, in ListW.sumint28, we can't use this approach because we want to constrain T, | |
| // a type param of the enclosing trait. | |
| def sumint27A[T <: Int](l: List[T]) : Int = l.reduceLeft((a: Int, b: Int) => a + b) | |
| trait IntLike[X] extends (X => Int) | |
| object IntLike { | |
| implicit val intIntLike: IntLike[Int] = new IntLike[Int] { def apply(x: Int) = identity(x) } | |
| } |
| So you've cloned somebody's repo from github, but now you want to fork it and contribute back. Never fear! | |
| Technically, when you fork "origin" should be your fork and "upstream" should be the project you forked; however, if you're willing to break this convention then it's easy. | |
| * Off the top of my head * | |
| 1. Fork their repo on Github | |
| 2. In your local, add a new remote to your fork; then fetch it, and push your changes up to it | |
| git remote add my-fork git@github...my-fork.git |
I just had to set up Jenkins to use GitHub. My notes (to myself, mostly):
For setting up Jenkins to build GitHub projects. This assumes some ability to manage Jenkins, use the command line, set up a utility LDAP account, etc. Please share or improve this Gist as needed.
| /** | |
| * We can use the Scala type system (with help from Miles Sabin's Shapeless | |
| * library) to solve the bank account number validation problem in the second | |
| * user story of the KataBankOCR kata on Coding Dojo: | |
| * | |
| * http://codingdojo.org/cgi-bin/wiki.pl?KataBankOCR | |
| * | |
| * By Travis Brown in response to a question by Paul Snively on the Shapeless | |
| * Dev mailing list: | |
| * |
| class Node(object): | |
| """ | |
| Tree node: left and right child + data which can be any object | |
| """ | |
| def __init__(self, data): | |
| """ | |
| Node Constructor | |
| @param data node data object | |
| """ | |
| self.left = None |
| /** | |
| * A monad to abstract dependencies in the code, see https://coderwall.com/p/kh_z5g | |
| */ | |
| object Reader { | |
| /** | |
| * an implicit to convert a function A => B in a Reader[A, B] | |
| */ | |
| implicit def reader[C, R](block: C => R): Reader[C, R] = Reader(block) |
| #!/bin/sh | |
| # one way (older scala version will be installed) | |
| # sudo apt-get install scala | |
| #2nd way | |
| sudo apt-get remove scala-library scala | |
| wget http://www.scala-lang.org/files/archive/scala-2.11.4.deb | |
| sudo dpkg -i scala-2.11.4.deb | |
| sudo apt-get update |
| # delete local tag '12345' | |
| git tag -d 12345 | |
| # delete remote tag '12345' (eg, GitHub version too) | |
| git push origin :refs/tags/12345 | |
| # alternative approach | |
| git push --delete origin tagName | |
| git tag -d tagName |