以下 Scala 代码有什么问题？
What's wrong with the following Scala code?
val x = "pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicgwrvycphqnulnjgfgjlqnhdyfwweyifpxyxrvpnshjrrkmkwrvjjssublanosljhqhppmewuidyqblfcjzkwbhqlljvvcjqthbkpcoquepqzcvbkdlhufbkpiyaqbfblexry"
val y = "pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicgcjkyxxubpbqcycioryppydvmwubupxrjlwrwujsiimvpbgkdugjbpqtodgbzzpsduewwovwlfrarfiuaztmmohagkjzzdcnjytamlzpwpfmhlgsdlwfbluxqllcjxbltbrlhgngvtxyksllhfhhzknesqggfazixcotpwwbjenbglhcbnhgjgyimfvfbcezatumthzrqtvdyirxulfhwylbdhkibmiagdgeerriszbnfxmoxgabaxkgkydrnrrbatjbavwdxjqirqivqweqdxeiiotbfidiemakmzbwszgrgekrlalsmbplumxeqmfrulddmbactyuhdljlhhjvxumpkyyzouybtwxtoyiffrderzmztkcdsbhcij"
val xy = (x zip y).filter{ case (a,b) => (a==b) }.map{case (a,b) => a}.mkString
我预计 xy 会是
pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicg
但它是
pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicgydwrsjzpdlblr
不知何故，过滤没有按预期工作。我错过了什么吗？
filter 不会在第一个 false 之后停止，而是继续遍历剩余的集合。这些额外的字符稍后出现在两个字符串的相同位置。你想要的而不是过滤器是 takeWhile:
val xy = (x zip y).takeWhile{ case (a,b) => (a==b) }.map{case (a,b) => a}.mkString
val x = "pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicgwrvycphqnulnjgfgjlqnhdyfwweyifpxyxrvpnshjrrkmkwrvjjssublanosljhqhppmewuidyqblfcjzkwbhqlljvvcjqthbkpcoquepqzcvbkdlhufbkpiyaqbfblexry"
val y = "pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicgcjkyxxubpbqcycioryppydvmwubupxrjlwrwujsiimvpbgkdugjbpqtodgbzzpsduewwovwlfrarfiuaztmmohagkjzzdcnjytamlzpwpfmhlgsdlwfbluxqllcjxbltbrlhgngvtxyksllhfhhzknesqggfazixcotpwwbjenbglhcbnhgjgyimfvfbcezatumthzrqtvdyirxulfhwylbdhkibmiagdgeerriszbnfxmoxgabaxkgkydrnrrbatjbavwdxjqirqivqweqdxeiiotbfidiemakmzbwszgrgekrlalsmbplumxeqmfrulddmbactyuhdljlhhjvxumpkyyzouybtwxtoyiffrderzmztkcdsbhcij"
val xy = (x zip y).filter{ case (a,b) => (a==b) }.map{case (a,b) => a}.mkString
我预计 xy 会是
pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicg
但它是
pizseagtsgevlvwpbshxfwbjijtmslkufgofretehjgpcdedstydokejsnrccnkbruawgjmemfqhwmhjsykrejmmexgrsdlwtaybtnhfcapsylopkthboqkvicgydwrsjzpdlblr
不知何故，过滤没有按预期工作。我错过了什么吗？
filter 不会在第一个 false 之后停止，而是继续遍历剩余的集合。这些额外的字符稍后出现在两个字符串的相同位置。你想要的而不是过滤器是 takeWhile:
val xy = (x zip y).takeWhile{ case (a,b) => (a==b) }.map{case (a,b) => a}.mkString