如何使用scala组合两个列表? [英] How to combine two lists using scala?
本文介绍了如何使用scala组合两个列表?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有以下列表 -
val A = List(("A","B","C","D"),("A1","B1","C1","D1"),("A2","B2","C2","D2"))
和
val B = List(("P","Q","R","S","T"),("P1","Q1","R1","S1","T1"),("P2","Q2","R2","S2","T2"),("P3","Q3","R3","S3","T3"))
我想将列表 A 的第一个元素与列表 B 的第一个元素合并,依此类推.这里列表 A 有 3 个元素,B 有 4 个.我想在合并时考虑列表 A 中的元素数量.
I want to merge 1st element of list A with first element of list B and so on. here list A have 3 elements and B have 4. I want to consider number of elements in list A while merging.
输出如下
val combineList = List(("A","B","C","D","P","Q","R","S","T"),("A1","B1","C1","D1","P1","Q1","R1","S1","T1"),
("A2","B2","C2","D2","P2","Q2","R2","S2","T2"))
推荐答案
如果你能用shapeless,那你就干脆做
If you can use shapeless, then you can simply do
scala> import shapeless.syntax.std.tuple._
scala> A.zip(B).map{case(a,b) => a ++ b}
res1: List[(String, String, String, String, String, String, String, String, String)] = List((A,B,C,D,P,Q,R,S,T), (A1,B1,C1,D1,P1,Q1,R1,S1,T1), (A2,B2,C2,D2,P2,Q2,R2,S2,T2))
它可以处理任意大小的元组.
It will work on arbitrary size of tuples.
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