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Advance the support of Scala.js in Dotty, a tutorial

Dotty contains preliminary support for Scala.js under the flag -scalajs. Or rather, it contains the infrastructure for preliminary support. It is far from being actually usable, but this is where you can help!

This small tutorial walks you through a few steps that you can do to further the support of Scala.js in Dotty. Even if you do not typically contribute to a compiler, this can be your chance. It is not very difficult, given that there already exists an extensive test suite, as well as a working implementation for scalac.

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Introduction to scalaz-stream

Every application ever written can be viewed as some sort of transformation on data. Data can come from different sources, such as a network or a file or user input or the Large Hadron Collider. It can come from many sources all at once to be merged and aggregated in interesting ways, and it can be produced into many different output sinks, such as a network or files or graphical user interfaces. You might produce your output all at once, as a big data dump at the end of the world (right before your program shuts down), or you might produce it more incrementally. Every application fits into this model.

The scalaz-stream project is an attempt to make it easy to construct, test and scale programs that fit within this model (which is to say, everything). It does this by providing an abstraction around a "stream" of data, which is really just this notion of some number of data being sequentially pulled out of some unspecified data source. On top of this abstraction, sca

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func getQueryStringParameter(url: String, param: String) -> String? {
        
    let url = NSURLComponents(string: url)!
      
    return
      (url.queryItems? as [NSURLQueryItem])
      .filter({ (item) in item.name == param }).first?
      .value()
  }

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Multiple MySQL Versions with Homebrew

For homebrew version 0.9.5.

brew -v # => Homebrew 0.9.5

Install the current version of mysql.

# Install current mysql version

brew install mysql

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Install MySQL on macOS Sierra

This procedure explains how to install MySQL using Homebrew on macOS Sierra 10.12

Install Homebrew

• Installing Homebrew is effortless, open Terminal and enter :
  $ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
• Note: Homebrew will download and install Command Line Tools for Xcode 8.0 as part of the installation process.

Install MySQL

At this time of writing, Homebrew has MySQL version 5.7.15 as default formulae in its main repository :

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val argumentList = List("arg1"->"val1", "arg2"->"val2", "arg3"->"val3")
// repl> argumentList: List[(String, String)] = List((arg1,val1), (arg2,val2), (arg3,val3))

// from play 2.1 scala api
// def withQueryString(parameters: (String, String)*): WSRequestHolder
// can't pass List[(String, String)] to function because it expects type (String, String)
// unwrap collection (List) with : _*
play.api.libs.ws.WS.url("http://localhost").withQueryString(argumentList : _*).get

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SQL to MongoDB Mapping Chart

SQL to MongoDB Mapping Chart¶

In addition to the charts that follow, you might want to consider the Frequently Asked Questions section for a selection of common questions about MongoDB.

Executables¶

The following table presents the MySQL/Oracle executables and the corresponding MongoDB executables.

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language: java
env:
  - SCALA_VERSION=2.11.7
os:
  - osx
script:
  - ./sbt "++$SCALA_VERSION" test
matrix:
  include:
    - env: SCALA_VERSION=2.11.7

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#OpenCV on the Mac with Nvidia CUDA and Python support using Homebrew

##Prerequisites

• XCode
• CUDA
• Homebrew
  • CMake
  • GCC 4.5+
• Python

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  var scheme = (("https:" == document.location.protocol) ? "https" : "http");
  var adnxs_domain = 'secure.adnxs.com';
  var aol_domain = 'secure.leadback.advertising.com';
  var rule = ["*", "*"];
  if (scheme=='http') { adnxs_domain = 'ib.adnxs.com'; aol_domain = 'leadback.advertising.com';}
  var el = document.createElement("div");
  el.style["width"] = "1px";
  el.style["height"] = "1px";
  el.style["display"] = "inline";