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This is the first method we use to append Scala List using the operator “:+”. The syntax we use in this method is; first to declare the list name and then use the ':+' method rather than the new element that will be appended in the list. The syntax looks like “List name:+ new elements”.
For adding an element to the array, First, you can convert array to ArrayList using 'asList ()' method of ArrayList. Add an element to the ArrayList using the 'add' method. Convert the ArrayList back to the array using the 'toArray()' method.
We can use ArrayList as the intermediate structure and add the elements into the ArrayList using the add () method. ArrayList is a data structure that allows us to dynamically add elements. However, we can convert the ArrayList to the array by using the toArray() method.
You can use :+ to append element to array and +: to prepend it:
0 +: array :+ 4
should produce:
res3: Array[Int] = Array(0, 1, 2, 3, 4)
It's the same as with any other implementation of Seq.
val array2 = array :+ 4
//Array(1, 2, 3, 4)
Works also "reversed":
val array2 = 4 +: array
Array(4, 1, 2, 3)
There is also an "in-place" version:
var array = Array( 1, 2, 3 )
array +:= 4
//Array(4, 1, 2, 3)
array :+= 0
//Array(4, 1, 2, 3, 0)
The easiest might be:
Array(1, 2, 3) :+ 4
Actually, Array can be implcitly transformed in a WrappedArray
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