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import collection.immutable.HashMap
object Test {
def main(args: Array[String]): Unit = {
resolveDefault()
resolveFirst()
resolveSecond()
resolveMany()
}
def resolveDefault(): Unit = {
val a = HashMap(1 -> "1")
val b = HashMap(1 -> "2")
val r = a.merged(b)(null)
println(r)
println(r(1))
}
def resolveFirst(): Unit = {
val a = HashMap(1 -> "1")
val b = HashMap(1 -> "2")
def collision(a: (Int, String), b: (Int, String)) = {
println(a)
a
}
val r = a.merged(b) { collision }
println(r)
println(r(1))
}
def resolveSecond(): Unit = {
val a = HashMap(1 -> "1")
val b = HashMap(1 -> "2")
def collision(a: (Int, String), b: (Int, String)) = {
println(b)
b
}
val r = a.merged(b) { collision }
println(r)
println(r(1))
}
def resolveMany(): Unit = {
val a = HashMap((0 until 100) zip (0 until 100): _*)
val b = HashMap((0 until 100) zip (100 until 200): _*)
def collision(a: (Int, Int), b: (Int, Int)) = {
(a._1, a._2 + b._2)
}
val r = a.merged(b) { collision }
for ((k, v) <- r) assert(v == 100 + 2 * k, (k, v))
}
}
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