Hash join: Difference between revisions
Added Kotlin
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Line 1,338:
[28,"Alan","Zombies"]
[28,"Glory","Buffy"]</lang>
=={{header|Kotlin}}==
<lang scala>// version 1.1.1
data class A(val age: Int, val name: String)
data class B(val character: String, val nemesis: String)
data class C(val rowA: A, val rowB: B)
fun hashJoin(tableA: List<A>, tableB: List<B>): List<C> {
val mm = tableB.groupBy { it.character }
val tableC = mutableListOf<C>()
for (a in tableA) {
val value = mm[a.name]
if (value == null) continue
for (b in value) tableC.add(C(a, b))
}
return tableC.toList()
}
fun main(args: Array<String>) {
val tableA = listOf(
A(27, "Jonah"),
A(18, "Alan"),
A(28, "Glory"),
A(18, "Popeye"),
A(28, "Alan")
)
val tableB = listOf(
B("Jonah", "Whales"),
B("Jonah", "Spiders"),
B("Alan", "Ghosts"),
B("Alan", "Zombies"),
B("Glory", "Buffy")
)
val tableC = hashJoin(tableA, tableB)
println("A.Age A.Name B.Character B.Nemesis")
println("----- ------ ----------- ---------")
for (c in tableC) {
print("${c.rowA.age} ${c.rowA.name.padEnd(6)} ")
println("${c.rowB.character.padEnd(6)} ${c.rowB.nemesis}")
}
}</lang>
{{out}}
<pre>
A.Age A.Name B.Character B.Nemesis
----- ------ ----------- ---------
27 Jonah Jonah Whales
27 Jonah Jonah Spiders
18 Alan Alan Ghosts
18 Alan Alan Zombies
28 Glory Glory Buffy
28 Alan Alan Ghosts
28 Alan Alan Zombies
</pre>
=={{header|LFE}}==
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