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September Morn Update

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Ingy döt Net 2019-09-12 10:33:56 -07:00
parent 4e2d22a71d
commit aac6731f2c
6856 changed files with 141342 additions and 21127 deletions
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74
Task/XML-XPath/Scala/xml-xpath.scala
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@ -1,4 +1,5 @@
scala> val xml = <inventory title="OmniCorp Store #45x10^3">
scala> val xml: scala.xml.Elem =
| <inventory title="OmniCorp Store #45x10^3">
| <section name="health">
| <item upc="123456789" stock="12">
| <name>Invisibility Cream</name>
@ -24,57 +25,34 @@ scala> val xml = <inventory title="OmniCorp Store #45x10^3">
| </item>
| </section>
| </inventory>
xml: scala.xml.Elem =
<inventory title="OmniCorp Store #45x10^3">
<section name="health">
<item upc="123456789" stock="12">
scala> val firstItem = for {
| firstSection <- (xml \ "section").headOption
| firstItem <- (firstSection \ "item").headOption
| } yield firstItem
firstItem: Option[scala.xml.Node] =
Some(<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>
</item>)
scala> val firstItem = xml \\ "item" head
firstItem: scala.xml.Node =
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
scala> val prices = for {
| section <- (xml \ "section")
| item <- (section \ "item")
| price <- (item \ "price")
| } yield scala.math.BigDecimal(price.text)
prices: List[scala.math.BigDecimal] = List(14.50, 23.99, 4.95, 3.56)
scala> xml \\ "price" foreach println
<price>14.50</price>
<price>23.99</price>
<price>4.95</price>
<price>3.56</price>
scala> val salesTax = prices.sum * 0.05
salesTax: scala.math.BigDecimal = 2.3500
scala> xml \\ "price" map (_ text) foreach println
14.50
23.99
4.95
3.56
scala> println(salesTax.setScale(2, BigDecimal.RoundingMode.HALF_UP))
2.35
scala> val elements = xml \\ "name" toArray
elements: Array[scala.xml.Node] = Array(<name>Invisibility Cream</name>, <name>Levitation Salve</name>, <name>Blork and
Freen Instameal</name>, <name>Grob winglets</name>)
scala> val values = xml \\ "name" map (_ text) toArray
values: Array[String] = Array(Invisibility Cream, Levitation Salve, Blork and Freen Instameal, Grob winglets)
scala> val names = for {
| section <- (xml \ "section").toArray
| item <- (section \ "item")
| name <- (item \ "name")
| } yield name.text
names: Array[String] = Array(Invisibility Cream, Levitation Salve, Blork and Freen Instameal, Grob winglets)