以下Scala代码有什么问题？

Question

val x = "pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicgwrvycphqnulnjgfgjlqnhdyfwweyifpxyxrvpnshjrrkmkwrvjjssublanosljhqhppmewuidyqblfcjzkwbhqlljvvcjqthbkpcoquepqzcvbkdlhufbkpiyaqbfblexry"
val y = "pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicgcjkyxxubpbqcycioryppydvmwubupxrjlwrwujsiimvpbgkdugjbpqtodgbzzpsduewwovwlfrarfiuaztmmohagkjzzdcnjytamlzpwpfmhlgsdlwfbluxqllcjxbltbrlhgngvtxyksllhfhhzknesqggfazixcotpwwbjenbglhcbnhgjgyimfvfbcezatumthzrqtvdyirxulfhwylbdhkibmiagdgeerriszbnfxmoxgabaxkgkydrnrrbatjbavwdxjqirqivqweqdxeiiotbfidiemakmzbwszgrgekrlalsmbplumxeqmfrulddmbactyuhdljlhhjvxumpkyyzouybtwxtoyiffrderzmztkcdsbhcij"
val xy = (x zip y).filter{ case (a,b) => (a==b) }.map{case (a,b) => a}.mkString

我希望xy将是

  

pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicg

但它是

  

pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicgydwrsjzpdlblr

不知何故，过滤不能按预期工作。我错过了什么？

Answer 1

filter在第一个false之后不会停止，但会继续遍历剩余的集合。这些附加字符稍后出现在同一位置的两个字符串中。你想要的不是过滤器takeWhile：

val xy = (x zip y).takeWhile{ case (a,b) => (a==b) }.map{case (a,b) => a}.mkString