Created
April 13, 2018 11:19
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?.scala
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scala> List(1,2,3).map({println("1");_+1}).map({println("a"); _+1}) | |
1 | |
a | |
res21: List[Int] = List(3, 4, 5) | |
scala> List(1,2,3).map({println("1");_+1}).map(a=>{println("a"); a+1}) | |
1 | |
a | |
a | |
a | |
res22: List[Int] = List(3, 4, 5) |
Author
quiye
commented
Apr 14, 2018
•
理由がわかった。
scala> val g = {println("1");a:Int => a+a}
1
g: Int => Int = $$Lambda$1389/575389119@18391220
scala> val z = (a:Int) => {println("1");a+a}
z: Int => Int = $$Lambda$1390/762846891@2c2c9a4
scala> g(5)
res71: Int = 10
scala> z(5)
1
res72: Int = 10
となるが、よくみると
scala> val g = {
| println("1")
| a:Int => a + a //ここが返り値となりgに代入される
| }
1
g: Int => Int = $$Lambda$1391/1516087924@1fd6c7eb
scala> val z = {
| (a:Int) => {println("1");a+a} // ここが返り値となりzに代入される
| }
z: Int => Int = $$Lambda$1392/63081259@1055adc6
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