how to join two array is scala

Question

suppose I have two arrays

val x =Array("one","two","three")
val y =Array("1","2","3")

what's the most elegant way to get a new array like ["one1","two2","three3"]

Michael Zajac · Accepted Answer · 2015-02-13 03:42:08Z

13

Using zip and map should do it:

(x zip y) map { case (a, b) => a + b }

answered Feb 13, 2015 at 3:42

Michael Zajac

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Comments

elm · Accepted Answer · 2015-02-13 11:39:03Z

3

Similarly to @m-z, with a for comprehension, like this,

for ( (a,b) <- x zip y ) yield a + b

This can be encapsulated into an implicit such as

implicit class StrArrayOps(val x: Array[String]) extends AnyVal { 
  def join(y: Array[String]) = 
    for ( (a,b) <- x zip y ) yield a + b 
}

and use it like this,

x join y
Array(one1, two2, three3)

answered Feb 13, 2015 at 8:04

elm

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user5102379 · Accepted Answer · 2015-02-13 11:01:20Z

0

As alternative to zip:

(0 until math.min(x.length, y.length))
          .map(i => x(i) + y(i))
          .toArray

answered Feb 13, 2015 at 11:01

user5102379

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