Scala: Array[Array[Int]] to Array[Int]

Question

So I have an array of array of ints, for example

val n = Array(Array(1,2,3), Array(4,5,6), Array(7,8,9))

But I want to convert this to get Array(1,2,3,4,5,6,7,8,9)

Is that even possible and how? Thanks!

mushroom · Accepted Answer · 2016-01-16 16:56:53Z

8

You can use the flatten method. Calling n.flatten will output Array(1,2,3,4,5,6,7,8,9).

answered Jan 16, 2016 at 16:56

mushroom

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Rok Kralj · Accepted Answer · 2016-01-16 17:12:31Z

4

In addition to mushroom's answer:

If it is you who is producing such 2D array (as opposed to getting it from an external source), you might make use of a .flatMap function instead of two nested .maps.

answered Jan 16, 2016 at 17:12

Rok Kralj

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1 Comment

DaunnC Over a year ago

Yes, and mb it will be useful, flatten can be written as a flatMap(identity).

elm · Accepted Answer · 2016-01-17 08:31:32Z

0

The idiomatic flatMap / flatten is the way to go; yet you can implement the flattening for instance with a for comprehension as follows,

for (i <- n; j <- i) yield j

answered Jan 17, 2016 at 8:31

elm

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