Programming in Scalaを読み始めた Chapter5

Scala

Chapter5はさらっと。

scala> 0x5
res1: Int = 5

scala> 0x00FF
res2: Int = 255

scala> 035
res3: Int = 29

scala> 35
res4: Int = 35

scala> 35L
res5: Long = 35

scala> 35l
res6: Long = 35

scala> 1.2345
res7: Double = 1.2345

scala> 1.2345e1
res8: Double = 12.345

scala> 123E45
res9: Double = 1.23E47

scala> 1.2345F 
res10: Float = 1.2345

scala> 3e5f   
res11: Float = 300000.0

scala> 3e5
res12: Double = 300000.0

scala> 3e5D
res13: Double = 300000.0

scala> 'A'
res14: Char = A

scala> '\101'
res15: Char = A

scala> '\u0041'
res16: Char = A

scala> val B\u0041\u0044 = 1
BAD: Int = 1

scala> val backslash = '\\'
backslash: Char = \

scala> val hello = "hello"
hello: java.lang.String = hello

scala> val escapes = "\\\"\'"
escapes: java.lang.String = \"'

scala> println("""Welcome to Ultamix 3000.
     | Type "HELP" for help.""")
Welcome to Ultamix 3000.
       Type "HELP" for help.

scala> println("""|Welcome to Ultamix 3000.
     |            |Type "HELP" for help.""".stripMargin)
Welcome to Ultamix 3000.
Type "HELP" for help.

scala> val s = 'aSymbol
s: Symbol = 'aSymbol

scala> s.name
res19: String = aSymbol

scala> var bool = true
bool: Boolean = true

scala> var fool = false
fool: Boolean = false

scala> val sum = 1 + 2
sum: Int = 3

scala> val sumMore = (1).+(2)
sumMore: Int = 3

scala> val longSum = 1+2L
longSum: Long = 3

scala> val s = "Hello, world!"
s: java.lang.String = Hello, world!

scala> s indexOf 'o'
res20: Int = 4

scala> s indexOf('o', 5)
res21: Int = 8

scala> -2.0
res22: Double = -2.0

scala> (2.0).unary_-
res23: Double = -2.0

scala> val s = "Hello, world!"
s: java.lang.String = Hello, world!

scala> s.toLowerCase
res24: java.lang.String = hello, world!

scala> s toLowerCase          
res26: java.lang.String = hello, world!

scala> val list1 = List(1,2,3)
list1: List[Int] = List(1, 2, 3)

scala> val list2 = List(1,2,3)
list2: List[Int] = List(1, 2, 3)

scala> list1 == list2
res27: Boolean = true

scala> list1.eq(list2)
res28: Boolean = false

scala> list1.eq(list1)
res29: Boolean = true

scala> list1.ne(list2)
res31: Boolean = true

scala> 0 max 5
res32: Int = 5

scala> -2.7 abs
res33: Double = 2.7

scala> -2.7 round
res34: Long = -3

scala> 4 to 6
res35: Range.Inclusive = Range(4, 5, 6)