How to convert string array to int array in scala

Applying a function to every element of a collection is done using .map :

scala> val arr = Array("1", "12", "123")
arr: Array[String] = Array(1, 12, 123)

scala> val intArr = arr.map(_.toInt)
intArr: Array[Int] = Array(1, 12, 123)

Note that the _.toInt notation is equivalent to x => x.toInt :

scala> val intArr = arr.map(x => x.toInt)
intArr: Array[Int] = Array(1, 12, 123)

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Obviously this will raise an exception if one of the element is not an integer :

scala> val arr = Array("1", "12", "123", "NaN")
arr: Array[String] = Array(1, 12, 123, NaN)

scala> val intArr = arr.map(_.toInt)
java.lang.NumberFormatException: For input string: "NaN"
  at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
  at java.lang.Integer.parseInt(Integer.java:580)
  at java.lang.Integer.parseInt(Integer.java:615)
  at scala.collection.immutable.StringLike$class.toInt(StringLike.scala:272)
  ...
  ... 33 elided