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pgebert/transposeTableInKotlin.kt

Last active December 13, 2023 18:22
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Transpose a list of lists in kotlin.
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transposeTableInKotlin.kt
fun <T> List<List<T>>.transpose(): List<List<T>> {
var transposed = mutableListOf<List<T>>()
for (i in first().indices) {
val col: MutableList<T> = ArrayList()
forEach { row ->
col.add(row[i])
}
transposed.add(col)
}
return transposed
}
// Example:
listOf(listOf('a', 'b'), listOf('a', 'b')).transpose() // -> listOf(listOf('a', 'a'), listOf('b', 'b'))
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