Created
March 17, 2012 00:55
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Head/Tail + Init/Last extractors mirroring append/prepend
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| (master *$%=) ➜ ./build/quick/bin/scala | |
| Welcome to Scala version 2.10.0-SNAPSHOT-20120316-312-d267988ddb (OpenJDK 64-Bit Server VM, Java 1.6.0_23). | |
| Type in expressions to have them evaluated. | |
| Type :help for more information. | |
| scala> val x = Vector(1,2,3,4) | |
| x: scala.collection.immutable.Vector[Int] = Vector(1, 2, 3, 4) | |
| scala> val y :+ z = x | |
| y: scala.collection.immutable.Vector[Int] = Vector(1, 2, 3) | |
| z: Int = 4 | |
| scala> val y +: z = x | |
| y: Int = 1 | |
| z: scala.collection.immutable.Vector[Int] = Vector(2, 3, 4) | |
| scala> val y +: z = collection.mutable.ArrayBuffer(1,2) | |
| y: Int = 1 | |
| z: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(2) | |
| scala> val y +: z = collection.mutable.ListBuffer(1,2) | |
| y: Int = 1 | |
| z: scala.collection.mutable.ListBuffer[Int] = ListBuffer(2) |
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