all

Tests whether every element in the array satisfies the given predicate. Returns true for empty arrays (vacuous truth), consistent with Kotlin's Iterable.all.

Signature

inline fun <T, D : Dimension> MultiArray<T, D>.all(
    predicate: (T) -> Boolean
): Boolean

Parameters

Parameter	Type	Description
`predicate`	`(T) -> Boolean`	Condition to test each element against.

Returns: true if every element satisfies predicate. Returns true for empty arrays.

Example

val a = mk.ndarray(mk[2, 4, 6, 8])

a.all { it % 2 == 0 }   // true
a.all { it > 5 }         // false

val empty = mk.ndarray(mk[0]).drop(1)
empty.all { it > 0 }     // true (vacuously true)

28 February 2026