Perfect water pressure finally compact and easy to install. Scala how to download url contents to a string or file. Scala also supports a general notion of pattern matching which can model the algebraic types used in many functional languages. There are not that many concepts, but sbt is not exactly like other build systems and there are details you will stumble on if you havent read the documentation the getting started guide covers the concepts you need to know to create and maintain an sbt build. Real world html can be very malformed, and a good library like htmlcleaner attempts to take care of all those problems for you. Covers creating a new scala project, a tour of scala s features, an introduction to classes and objects within scala, and much more. This is a little dated, but i hope its still helpful. Nesting of function definitions and higherorder functions are naturally supported. This makes them additionally useful for pattern matching.
Unlike the basic spark rdd api, the interfaces provided by spark sql provide spark with more information about the structure of both the data and the computation being performed. Scala has a special type of class called a case class. Heres a link to my companion document, a scala cheat sheet in pdf format. Also very importantly, it uses the apache pdfbox library to read pdf files and extract their text. Using mutable containers is almost always a wrong idea when writing scala. Indepth documentation covering many of scalas features. An excellent stepbystep introduction to many of the scala features with the help of simple code examples. Indepth documentation covering many of scala s features. Linking from a web page to a specific section anchor in pdf. Classestraits classes should be named in the camelcase style with the very. By default, case classes are immutable, and they are compared by value unlike classes, which are compared by reference. Scaladocs need to be useful to new users of the code as well as experienced users. This book is available in both paper and pdf ebook form.
Here are our reference manuals about the scala language. How do i download the contents of a url to a string or file in scala. In depth documentation covering many of scala s features. Converting pdf content to plain text with scala or java. Scala is a pure objectoriented language in the sense that every value is an object.
A handy cheatsheet covering the basics of scalas syntax. Rich operation scala provides rich wrapper around basic types via implicit conversions. Spark sql is a spark module for structured data processing. Scala is a modern multiparadigm programming language designed to express common programming patterns in a concise, elegant, and typesafe way. The scala journey 16 java scala oo features enough scala functional features to use use the scala api in apache spark fullblown functional programming. In our cloudhosted environment, we have the scalajupyter kernel installed for jupyter, so you can create scala notebooks if you have domino deployed on your own hardware, you can create a custom environment and install the scala kernel to give yourself the same functionality. Scala based build definition that can use the full. There is a standard from adobe that in theory specifies opening pdf documents from a link clicked in a browser in a way to open specific sections aka anchor, named reference of pdf document. Scala has been designed to interoperate seamlessly with java. This pdf is very different from my earlier scala cheat sheet in html format, as i tried to create something that works much better in a print format. Names used for objects, classes, variables and methods are called identifiers.
I first tried to get it all in one page, but short of using a onepoint font, that wasnt going to happen. Scala2 is a fully integrated water booster pump providing perfect water pressure in all taps at all times even with multiple taps and showers running at the same time. See contributors for the list of documentation contributors. This functionality should be of great help if one would like to refer to a specific portion of large pdf such as some standard or specification. An indepth guide on how to write idiomatic scala code.
The goal of this chapter is to get your fingers started typing and running scala code. Scaladoc generally follows the conventions of javadoc, but provides many additional features that simplify writing documentation for scala code. This document is intended to outline some basic scala stylistic guidelines which should be followed with more or less fervency. In our cloudhosted environment, we have the scalajupyter kernel installed for jupyter, so you can create scala notebooks if you have domino deployed on your own hardware, you can create a custom environment and install the scala kernel to. An introduction to computer networks html, pdf, kindle. A list of frequentlyasked questions about scala language features and their answers. Scala is a functional language in the sense that every function is a value. Scala could support callbyreference on the jvm, as simply as creating a container object to pass the reference or primitive, and then reading back from that container once the call returns. You can define case classes with the case class keywords. Passes the url to that instance, and gets a reference to the root node of the html document. Programming in scala preprint edition version 2 martin odersky is the creator of the scala language and a professor at epfl in lausanne, switzerland. Python data science handbook jake vanderplas html, jupyter notebooks python for everybody exploring data using python 3 charles severance pdf. Spark scala api scaladoc spark java api javadoc spark python api sphinx spark r api roxygen2 spark sql, built in functions mkdocs.
If you need a comprehensive and easy to follow manual for the scala language, the book programming in scala is the canonical reference text. It is based on the flying saucer library, which in turn uses itext for pdf generation. Dec 10, 2008 chapter 2 first steps in scala, shows you how to do a number of basic programming tasks in scala, without going into great detail about how they work. It seamlessly integrates features of objectoriented and functional languages. The source code for this project is written in scala, and the gui uses akka actors to help keep the gui from coming to a screaming halt when the pdf file is read. Scala native is an optimizing aheadoftime compiler and lightweight managed runtime designed specifically for scala. Wherever possible, this guide attempts to detail why a particular style is encouraged and how it relates to other alternatives. Introduction to scala and spark sei digital library. An in depth guide on how to write idiomatic scala code. But if you insist on doing it your way, you will have to show more code, because everything is passed by reference in scala, so your problem is with something else i am guessing, you are using a wrong function to mutate your buffer. Scala by example learn scala through a series of examples. Here you can read api docs for spark and its submodules. Here are some of the ways you can define andor create functions in scala. Parsing real world html with scala, htmlcleaner, and.
To write applications in scala, you will need to use a compatible scala version e. Getting started tour of scala scala book scala for java programmers online resources. To request new entries, suggest corrections or provide translations go. You can access the courses material and exercises by either signing up for the specialization or auditing the courses individually. This document is a scala cheat sheet reference page, in html format. A handy cheatsheet covering the basics of scala s syntax. In general, you want to worry more about substance and writing style than about formatting. The scala language specification this is the most technical and detailed manual concerning the inner working of the scala language. I ran a few tests last night in the scala repl to see if i could think of different ways to download the contents of a url to a string or file in scala, and came up with a. It simply renders your html and cssbased templates to pdf. We owe a great debt to abelsons and sussmans wonderful book structure and interpretation of computer programsass96.
The best way to do this in scala would be to not do it at all. Lex spoon worked on scala for two years as a postdoc with martin odersky. Lambda calculus, category theory, closures, monads, functors, actors. Support for html, epub, pdf, xslfo and ast for debugging as output. Fixes for nested self references, missing optional self references, and objects without or. Heres the download link for my scala cheat sheet file.
It packs pump, motor, tank, sensor, drive and nonreturn valve into one compact unit. Scala reference manuals the scala programming language. Arraystring scala program processing starts from the main method which is a mandatory part of every scala program. Well organized and easy to understand web building tutorials with lots of examples of how to use html, css, javascript, sql, php, python, bootstrap, java. Spark scala api scaladoc spark java api javadoc spark python api sphinx spark r api roxygen2 spark sql, builtin functions mkdocs. Scala vs java api vs python spark was originally written in scala, which allows concise function syntax and interactive use java api added for standalone applications python api added more recently along with an interactive shell. The scala command will execute a source script by wrapping it in a template and then compiling and executing the resulting program. The specialization provides a handson introduction to functional programming using scala. Many of their examples and exercises are also present here. Visual scala reference this guide collects some of the most common functions of the scala programming language and explain them conceptual and graphically in a simple way. As with all style guides, treat this document as a list of rules to be broken. Chapter 2 first steps in scala, shows you how to do a number of basic programming tasks in scala, without going into great detail about how they work.
If you are using an older version of this library, see this document for the version youre using. Covers creating a new scala project, a tour of scalas features, an introduction to classes and objects within scala, and much more. To request new entries, suggest corrections or provide translations go to the this projects repository in github. An implementation of the browser trait, such as jsoupbrowser, can be used to fetch html from the web or to parse a local html file or string. Please note that there are a few important exceptions to this guideline as given below. This page is a work in progress, but as ive been learning scala, ive been creating all sorts of little notes, and im now trying to organize them into this scala cheat sheet. Transform markdown or restructuredtext into html or pdf with templating. This module helps in generating pdf documents dynamically from your scala application. Spark can be built to work with other versions of scala, too. This book is a tutorial for the scala programming language, written by peo ple directly involved in the.
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