Get element at index of a Array[(Array[String, Long)]

Question

So I have some data:

val data = Array[(Array[String], Long)]

Which is an array of pairs, where each pair consists of another array and a number. I have created a ListBuffer as follows:

var x = ListBuffer[(Array[String], Long)]

I would like to append an element at some index i to x. I do the following:

 x += data(i)

However, I get the error:

Type mismatch, expected: String, actual: (Array[String], Long)

What am I doing wrong? I am working in IntelliJ and Scala 2.10.7.

Also this example (which is a concrete example (I cannot provide the original example)) also gives the same error:

val xData = ListBuffer[(Array[String], Long)]
    var x = ListBuffer[(Array[String], Long)]
    x += xData(0)

Could you please provide a complete example?

P3trur0
– P3trur0

2017-12-07 11:02:57 +00:00
Commented Dec 7, 2017 at 11:02 — P3trur0
– P3trur0, Commented Dec 7, 2017 at 11:02
I added a different example, but same error, it is concrete

osk
– osk

2017-12-07 11:30:16 +00:00
Commented Dec 7, 2017 at 11:30 — osk
– osk, Commented Dec 7, 2017 at 11:30

S.K · Accepted Answer · 2017-12-07 11:18:44Z

1

I have tried the same thing in scala REPL just now, and it is working fine.

What I did is -

    scala> val arr = Array("Hello", "Bye")
    arr: Array[String] = Array(Hello, Bye)

    scala> var data = Array((arr,1), (arr,2))
    data: Array[(Array[String], Int)] = Array((Array(Hello, Bye),1), 
    (Array(Hello, Bye),2))

    scala> import scala.collection.mutable.ListBuffer
    import scala.collection.mutable.ListBuffer


    scala> val list = ListBuffer((arr, 1))
    list: scala.collection.mutable.ListBuffer[(Array[String], Int)] = 
    ListBuffer((Array(Hello, Bye),1))


    scala> list += data(0)
    res1: list.type = ListBuffer((Array(Hello, Bye),1), (Array(Hello, 
    Bye),1))

It did not give any error

answered Dec 7, 2017 at 11:18

S.K

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3 Comments

osk Over a year ago

Hmm, it's odd, can it be because I never specified how Array[String] should be?

osk Over a year ago

I cant make an array and use it to create a ListBuffer, it says it doesnt know what the array is. So even your example is broken

S.K Over a year ago

There must be some problem in the way you are creating the variables.

osk · Accepted Answer · 2017-12-07 12:14:32Z

0

So the issue was that I forgot brackets at the end of ListBuffer initiation.

This works:

var x = ListBuffer[(Array[String], Long)]()

answered Dec 7, 2017 at 12:14

osk

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3 Comments

Anahcolus Over a year ago

you can't assign dataTypes to variables?

osk Over a year ago

What do you mean?

Anahcolus Over a year ago

ListBuffer[(Array[String], Long)] is definition of datatypes and you can't assign datatypes as you did. you can define datatypes using : as var x: ListBuffer[(Array[String], Long)] = actual value

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