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scala-exercises.47deg.com

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google-site-verification: googlef7ad26181520ab2a.html

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<!DOCTYPE html> <html class=no-js lang=en> <head> <meta charset=utf-8> <meta name=viewport content="width=device-width"> <link rel="shortcut icon" href=images/2c11a128.favicon.png> <!-- Update your html tag to include the itemscope and itemtype attributes. --> <html itemscope itemtype=http://schema.org/Article> <!-- Place this data between the <head> tags of your website --> <title>Scala Exercises | The easy way to learn Scala</title> <meta name=description content="Introducing Scala Exercises: Quick lessons that will get you on your way to learning Scala in no time."> <meta name=keywords content="Scala, Koans, Exercises, Scala Koans, Open Source, Lessons"> <meta name=author content="47 Degrees"> <!-- Schema.org markup for Google+ --> <meta itemprop=name content="Scala Exercises"> <meta itemprop=description content="Introducing Scala Exercises: Quick lessons that will get you on your way to learning Scala in no time."> <meta itemprop=image content=http://scala-exercises.47deg.com/static/social_image.jpg> <!-- Twitter Card data --> <meta name=twitter:card content=summary_large_image> <meta name=twitter:site content=@47deg> <meta name=twitter:title content="Scala Exercises"> <meta name=twitter:description content="The easy way to learn Scala."> <meta name=twitter:creator content=@47deg> <!-- Twitter summary card with large image must be at least 280x150px --> <meta name=twitter:image:src content=http://scala-exercises.47deg.com/static/social_image_h.jpg> <!-- Publisher Google Plus --> <meta name=twitter:image:src content=http://scala-exercises.47deg.com/static/social_image_h.jpg> <!-- Open Graph data --> <meta property=og:title content="Scala Exercises"> <meta property=og:type content="article"> <meta property=og:url content="http://scala-exercises.47deg.com/"> <meta property=og:image content="http://scala-exercises.47deg.com/static/social_image.jpg"> <meta property=og:description content="The easy way to learn Scala."> <meta property=og:site_name content="Scala Exercises"> <meta property=article:published_time content="2014-12-04T05:59:00+01:00"> <meta property=article:modified_time content="2014-12-04T05:59:00+01:00"> <meta property=article:section content="Home"> <meta property=article:tag content="Scala"> <!-- Place favicon.ico and apple-touch-icon.png in the root directory --> <link rel=stylesheet href=styles/e9ec9abd.main.css> <script src=scripts/vendor/3e1dbd5e.modernizr.js></script> <link rel=stylesheet href="//cdnjs.cloudflare.com/ajax/libs/animate.css/3.1.1/animate.min.css"> <body> <!--[if lt IE 10]>
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<![endif]--> <header id=intro> <div class=content-image></div> <div class="presentation animated fadeInDown"> <h1>Scala Exercises</h1> <p class=lead>The easy way to learn Scala.</p> <p class=lead> <button type=button class="btn btn-primary btn-lg" onclick="moveToDiv('content')">GET STARTED</button> </p> <div id=gitHubLayer> <a target=_blank href=https://github.com/47deg/scala-exercises> <i class="fa fa-github fa-main"></i><br>Contribute </a> <div class=row> <div class=col-xs-4> <a class=gitHubWidget target=_blank href=https://github.com/47deg/scala-exercises/watchers> <h2><i class="fa fa-eye"></i> <span id=eyes>00</span></h2> </a> </div> <div class=col-xs-4> <a class=gitHubWidget target=_blank href=https://github.com/47deg/scala-exercises/stargazers> <h2><i class="fa fa-star"></i> <span id=stars>00</span></h2> </a> </div> <div class=col-xs-4> <a class=gitHubWidget target=_blank href=https://github.com/47deg/scala-exercises/fork> <h2><i class="fa fa-code-fork"></i> <span id=forks>00</span></h2> </a> </div> </div> </div> </div> </header> <section id=content> <div class=container> <div class=introduction> <div class=row> <div class="col-md-8 col-md-offset-2"> <h2 class=text-center>How it works</h2> <p class="function text-center">"Scala Exercises" brings the popular <a href="http://www.scalakoans.org/">Scala Koans</a> to the web. 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Add new exercises or improve existing ones by sending a pull-request.</p> </div> </div> </div> </div> <div class=row> <div class=divider> <div class="col-md-12 text-center"> <hr> <span> <a href=koans><button type=button class="btn btn-primary btn-lg">Let's Begin!</button></a> </span> </div> </div> </div> </div> </section> <footer id=bottom> <div class=link-content> <div class="content-image content-image-footer"></div> <div class=container> <div class=row> <div class="col-md-4 text-center item"> <a href=https://typesafe.com/resources/e-books target=_blank> <div class="icon-general icon-books"></div> <h3>Books</h3> <p>Deepen your knowledge of Scala with this collection of books recommended by Typesafe.</p> </a> </div> <div class="col-md-4 text-center item"> <a href="http://docs.scala-lang.org/" target=_blank> <div class="icon-general icon-official-docs"></div> <h3>Official Docs</h3> <p>Access community-driven documentation for Scala including guides, tutorials and a glossary.</p> </a> </div> <div class="col-md-4 text-center item"> <a href=http://www.47deg.com/blog/tags/scala target=_blank> <div class="icon-general icon-blog"></div> <h3>Blog</h3> <p>At 47 Degrees we occasionally write about Scala on our blog. 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‎dist/json/asserts.json

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{
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"title": "Asserts",
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"modules": [
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{
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"preparagraph": "ScalaTest makes three assertions available by default in any style trait. You can use:\n\n- `assert` for general assertions;\n- `assertResult` to differentiate expected from actual values;\n- `intercept` to ensure a bit of code throws an expected exception.\n\nIn any Scala program, you can write assertions by invoking `assert` and passing in a `Boolean` expression:\n\n```\nval left = 2\nval right = 1\nassert(left == right)\n``` \n\nIf the passed expression is `true`, `assert` will return normally. If `false`,\nScala's `assert` will complete abruptly with an `AssertionError`. This behavior is provided by\nthe `assert` method defined in object `Predef`, whose members are implicitly imported into every Scala source file.\n\n\nScalaTest provides a domain specific language (DSL) for expressing assertions in tests\nusing the word `should`. ScalaTest matchers provides five different ways to check equality, each designed to address a different need. They are:\n\n```\nresult should equal (3) // can customize equality\nresult should === (3) // can customize equality and enforce type constraints\nresult should be (3) // cannot customize equality, so fastest to compile\nresult shouldEqual 3 // can customize equality, no parentheses required\nresult shouldBe 3 // cannot customize equality, so fastest to compile, no parentheses required\n```\n\nCome on, your turn: true and false values can be compared with should matchers",
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"code": "true should be(__)",
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"solutions": [
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"true"
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],
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"postparagraph": ""
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},
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{
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"preparagraph": "Booleans in asserts can test equality.",
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"code": "val v1 = 4\nval v2 = 4\nv1 === __",
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"solutions": [
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"v2"
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],
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"postparagraph": "`===` is an assert. It is from ScalaTest, not from the Scala language."
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},
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{
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"preparagraph": "Sometimes we expect you to fill in the values",
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"code": "assert(__ == 1 + 1)",
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"solutions": [
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"2"
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],
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"postparagraph": ""
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}
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]
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}

‎dist/json/bynameparameter.json

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{
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"title": "ByName Parameter",
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"modules": [
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{
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"preparagraph": "`() => Int` is a Function type that takes a `Unit` type. `Unit` is known as `void` to a Java programmer. The function returns an `Int`. You can place this as a method parameter so that you can you use it as a block, but still it doesn't look quite right.",
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"code": "def calc(x: () => Int): Either[Throwable, Int] = {\n try {\n Right(x()) //An explicit call the the x function\n } catch {\n case b: Throwable => Left(b)\n }\n}\n\nval y = calc {() => //Having explicitly declaring that Unit is a parameter with ()\n 14 + 15\n}\n\ny should be (__)",
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"solutions": [
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"Right(29)"
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],
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"postparagraph": ""
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},
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{
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"preparagraph": "A by-name parameter does the same thing as the previous koan but there is no need to explicitly handle `Unit` or `()`. This is used extensively in scala to create blocks.",
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"code": "def calc(x: => Int): Either[Throwable, Int] = { //x is a call by name parameter\n try {\n Right(x)\n } catch {\n case b: Throwable => Left(b)\n }\n}\n\nval y = calc { //This looks like a natural block\n println(\"Here we go!\") //Some superfluous call\n val z = List(1, 2, 3, 4) //Another superfluous call\n 49 + 20\n}\n\ny should be (__)",
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"solutions": [
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"Right(69)"
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],
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"postparagraph": ""
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},
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{
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"preparagraph": "By name parameters can also be used with an *Object* and apply to make interesting block-like calls",
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"code": "object PigLatinizer {\n def apply(x: => String) = x.tail + x.head + \"ay\"\n}\n\nval result = PigLatinizer {\n val x = \"pret\"\n val z = \"zel\"\n x ++ z //concatenate the strings\n}\n\nresult should be (__)",
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"solutions": [
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"\"retzelpay\""
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],
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"postparagraph": ""
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}
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]
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}

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