Array concatenation: Difference between revisions

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 =={{header|Kotlin}}==
+<syntaxhighlight lang="kotlin">fun main() {
-There is no operator or standard library function for concatenating <code>Array</code> types. One option is to convert to <code>Collection</code>s, concatenate, and convert back:
+    val a = intArrayOf(1, 2, 3)
-<syntaxhighlight lang="kotlin">fun main(args: Array<String>) {
-    val a: Array<Int> = arrayOf(1, 2, 3) // initialise a
+    val b = intArrayOf(4, 5, 6)
-    val b: Array<Int> = arrayOf(4, 5, 6) // initialise b
+    val c = a + b // [1, 2, 3, 4, 5, 6]
+    println(c.contentToString())
-    val c: Array<Int> = (a.toList() + b.toList()).toTypedArray()
-    println(c)
-}</syntaxhighlight>
-Alternatively, we can write our own concatenation function:
-<syntaxhighlight lang="kotlin">fun arrayConcat(a: Array<Any>, b: Array<Any>): Array<Any> {
-    return Array(a.size + b.size, { if (it in a.indices) a[it] else b[it - a.size] })
-}</syntaxhighlight>
-When working directly with <code>Collection</code>s, we can simply use the <code>+</code> operator:
-<syntaxhighlight lang="kotlin">fun main(args: Array<String>) {
-    val a: Collection<Int> = listOf(1, 2, 3) // initialise a
-    val b: Collection<Int> = listOf(4, 5, 6) // initialise b
-    val c: Collection<Int> = a + b
-    println(c)
 }</syntaxhighlight>