I am new to Scala and want to know whats the best way to avoid using null in Scala.How to refactor following logic :
var nnode : Node = null
if (i==str.length-1) {
nnode = Node(ch,mutable.Map[Char,Node](), collection.mutable.Set(str))
} else {
nnode = Node(ch,mutable.Map[Char,Node](), collection.mutable.Set())
}
nnode...
Since the last parameter is the only one that is affected, they rest of the code only needs to be written once:
val set = if (i == str.length - 1) collection.mutable.Set(str) else collection.mutable.Set()
val nnode = Node(ch, mutable.Map[Char, Node](), set)
You could also avoid a val and put the calculation of set inside the Node constructor:
val nnode = Node(
ch,
mutable.Map[Char, Node](),
if (i == str.length - 1) collection.mutable.Set(str) else collection.mutable.Set()
)
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