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. 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. Also very importantly, it uses the apache pdfbox library to read pdf files and extract their text. By default, case classes are immutable, and they are compared by value unlike classes, which are compared by reference. Here are some of the ways you can define andor create functions in scala. Support for html, epub, pdf, xslfo and ast for debugging as output. You can define case classes with the case class keywords. Spark scala api scaladoc spark java api javadoc spark python api sphinx spark r api roxygen2 spark sql, builtin functions mkdocs. Scala is a pure objectoriented language in the sense that every value is an object. Heres a link to my companion document, a scala cheat sheet in pdf format. Rich operation scala provides rich wrapper around basic types via implicit conversions. Heres the download link for my scala cheat sheet file. 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.
Wherever possible, this guide attempts to detail why a particular style is encouraged and how it relates to other alternatives. Converting pdf content to plain text with scala or java. The best way to do this in scala would be to not do it at all. Covers creating a new scala project, a tour of scalas features, an introduction to classes and objects within scala, and much more. Classestraits classes should be named in the camelcase style with the very. 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. An in depth guide on how to write idiomatic scala code. An introduction to computer networks html, pdf, kindle. This document is a scala cheat sheet reference page, in html format. Scala has a special type of class called a case class. An excellent stepbystep introduction to many of the scala features with the help of simple code examples. 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. Introduction to scala and spark sei digital library. The specialization provides a handson introduction to functional programming using scala.
Scala based build definition that can use the full. 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. It packs pump, motor, tank, sensor, drive and nonreturn valve into one compact unit. 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. The scala command will execute a source script by wrapping it in a template and then compiling and executing the resulting program. 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. 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. An indepth guide on how to write idiomatic scala code. Fixes for nested self references, missing optional self references, and objects without or.
Passes the url to that instance, and gets a reference to the root node of the html document. 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. To write applications in scala, you will need to use a compatible scala version e. If you are using an older version of this library, see this document for the version youre using. 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. 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. Many of their examples and exercises are also present here. 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.
This book is available in both paper and pdf ebook form. It seamlessly integrates features of objectoriented and functional languages. If you need a comprehensive and easy to follow manual for the scala language, the book programming in scala is the canonical reference text. Getting started tour of scala scala book scala for java programmers online resources. Transform markdown or restructuredtext into html or pdf with templating. 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. This module helps in generating pdf documents dynamically from your scala application. Scaladocs need to be useful to new users of the code as well as experienced users.
In general, you want to worry more about substance and writing style than about formatting. Indepth documentation covering many of scala s features. The goal of this chapter is to get your fingers started typing and running scala code. I first tried to get it all in one page, but short of using a onepoint font, that wasnt going to happen. This book is a tutorial for the scala programming language, written by peo ple directly involved in the. Perfect water pressure finally compact and easy to install. Spark can be built to work with other versions of scala, too.
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. Parsing real world html with scala, htmlcleaner, and. A handy cheatsheet covering the basics of scalas syntax. 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. Scala how to download url contents to a string or file. Indepth documentation covering many of scalas features. To write a spark application, you need to add a maven dependency on spark.
Spark scala api scaladoc spark java api javadoc spark python api sphinx spark r api roxygen2 spark sql, built in functions mkdocs. You can access the courses material and exercises by either signing up for the specialization or auditing the courses individually. 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. Please note that there are a few important exceptions to this guideline as given below. Covers creating a new scala project, a tour of scala s features, an introduction to classes and objects within scala, and much more. 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. Arraystring scala program processing starts from the main method which is a mandatory part of every scala program.
Scala is a functional language in the sense that every function is a value. Nesting of function definitions and higherorder functions are naturally supported. This is a little dated, but i hope its still helpful. Using mutable containers is almost always a wrong idea when writing scala.
It simply renders your html and cssbased templates to pdf. This repository contains the source for the scala documentation website, as well as the source for scala improvement process sip documents. 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. It is based on the flying saucer library, which in turn uses itext for pdf generation. The scala repl is a tool scala for evaluating expressions in scala. A list of frequentlyasked questions about scala language features and their answers. 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. To request new entries, suggest corrections or provide translations go. See contributors for the list of documentation contributors. Lambda calculus, category theory, closures, monads, functors, actors. We owe a great debt to abelsons and sussmans wonderful book structure and interpretation of computer programsass96. Here you can read api docs for spark and its submodules.
Scala also supports a general notion of pattern matching which can model the algebraic types used in many functional languages. The scala language specification this is the most technical and detailed manual concerning the inner working of the scala language. Scaladoc generally follows the conventions of javadoc, but provides many additional features that simplify writing documentation for scala code. Lex spoon worked on scala for two years as a postdoc with martin odersky. To request new entries, suggest corrections or provide translations go to the this projects repository in github. Linking from a web page to a specific section anchor in pdf.
As with all style guides, treat this document as a list of rules to be broken. Names used for objects, classes, variables and methods are called identifiers. 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. This document is intended to outline some basic scala stylistic guidelines which should be followed with more or less fervency. Scala reference manuals the scala programming language. Scala native is an optimizing aheadoftime compiler and lightweight managed runtime designed specifically for scala.
Scala by example learn scala through a series of examples. Python data science handbook jake vanderplas html, jupyter notebooks python for everybody exploring data using python 3 charles severance pdf. Scala is a modern multiparadigm programming language designed to express common programming patterns in a concise, elegant, and typesafe way. In depth documentation covering many of scala s features. Real world html can be very malformed, and a good library like htmlcleaner attempts to take care of all those problems for you. This makes them additionally useful for pattern matching.
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