forEach

Performs the given action on each element of the array. Indexed variants provide the element's flat index (forEachIndexed, 1D only) or multi-dimensional index (forEachMultiIndexed).

Signatures

inline fun <T, D : Dimension> MultiArray<T, D>.forEach(
    action: (T) -> Unit
)

inline fun <T> MultiArray<T, D1>.forEachIndexed(
    action: (index: Int, T) -> Unit
)

inline fun <T, D : Dimension> MultiArray<T, D>.forEachMultiIndexed(
    action: (index: IntArray, T) -> Unit
)

Parameters

Parameter	Type	Description
`action`	`(T) -> Unit`	Action to perform on each element.
`action`	`(index: Int, T) -> Unit`	Action with flat index (1D arrays only).
`action`	`(index: IntArray, T) -> Unit`	Action with multi-dimensional index.

Example

val a = mk.ndarray(mk[mk[1, 2], mk[3, 4]])

a.forEach { print("$it ") }
// 1 2 3 4

a.forEachMultiIndexed { idx, v ->
    println("${idx.toList()} -> $v")
}
// [0, 0] -> 1
// [0, 1] -> 2
// [1, 0] -> 3
// [1, 1] -> 4

28 February 2026