Concat two Scala Array

Question

I have two Array like this:

val l1 = Array((1,2,3), (6,2,-3), (6,2,-4))
val l2 = Array("a","b","c")

I would like to put values of l2 in array at the same position in l1 and obtain a final array like that

Array((1,2,3,"a"), (6,2,-3,"b"), (6,2,-4,"c"))

I was thinking about something like:

val l3 = l1.map( code...)

But i don't know how to iterate on l2 during map on l1.
Do you have any idea?

marios · Accepted Answer · 2016-11-16 01:57:54Z

6

Combining collections in this way can be done with Zipping.

l1.zip(l2).map{ case (x,y) => (x._1, x._2, x._3, y) }

answered Nov 16, 2016 at 1:57

marios

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Comments

jwvh · Accepted Answer · 2016-11-16 01:42:03Z

1

You'll want to map over the indexes used to access elements from each array.

(0 until l1.length).map{ idx =>
  (l1(idx)._1, l1(idx)._2, l1(idx)._3, l2(idx))
}
res0: IndexedSeq[(Int, Int, Int, Char)] = Vector((1,2,3,a), (6,2,-3,b), (6,2,-4,c))

answered Nov 16, 2016 at 1:42

jwvh

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3 Comments

a.moussa Over a year ago

Thank you very much

corvus_192 Over a year ago

You should use l1.indices instead of (0 until l1.length) to prevent off-by-one errors.

jwvh Over a year ago

@corvus_192, an excellent suggestion, but marios still has the better solution.

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