how to get map from array of data in scala

Question

i am a newbie in scala, here i have an array variable call colarr

colarr: Array[(String, String)] = Array((empid,IntegerType), (empname,StringType), (address,StringType), (salary,IntegerType), (doj,TimestampType))

how to get individual value like empid and IntergerType from it?

What exactly is you're trying to do? Get a single value? Get some of the values? Do elaborate. — Yuval Itzchakov
– Yuval Itzchakov, Commented Jan 5, 2017 at 13:17
these are column and datatype of table so i need to get the value and check its datatype — anand
– anand, Commented Jan 5, 2017 at 13:19
thanks Tzach, but how to iterate over each value and also it is not working it is showing error like <console>:48: error: not found: value empid colarr.toMap.get(empid) — anand
– anand, Commented Jan 5, 2017 at 13:20

Yuval Itzchakov · Accepted Answer · 2017-01-05 13:48:37Z

3

If you want to go over each tuple, you can use Array.foreach:

scala> val arr = Array(("hello", "world"), ("this", "isnice"), ("yay", "it works"))
scala> arr.foreach { 
        case (first, second) => println(s"First element $first, Second element: $second") }

First element hello, Second element: world
First element this, Second element: isnice
First element yay, Second element: it works

If you want to project a value from each tuple, you can use Array.map:

scala> arr.map { case (first, second) => s"$first, $second" }
res1: Array[String] = Array(hello, world, this, isnice, yay, it works)

The case (first, second) is just syntax for creating a partial function which allows you to extract the first and second element from the tuple.

If you want something simpler for starters, you can a total function and work with _.1 and _.2 elements of the tuple:

scala> arr.map(tuple => s"${tuple._1}, ${tuple._2}")
res2: Array[String] = Array(hello, world, this, isnice, yay, it works)

edited Jan 5, 2017 at 13:48

answered Jan 5, 2017 at 13:44

Yuval Itzchakov

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4 Comments

anand Over a year ago

Thank you Yuval, i could able to get the value.

Yuval Itzchakov Over a year ago

@anand arr.foreach { case (first, second) => if (first == value) { // Do stuff } }

anand Over a year ago

Yuval is there any way to check if $second is numeric ??

Yuval Itzchakov Over a year ago

What is the type or the tuple?

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