Collection

Number of elements in this collection.

Returns true when every element matches predicate.

Returns true when at least one element matches predicate.

Borrows this iterable as a lazy sequence without traversing or copying it. Each traversal requests a new source iterator; later mutations and invalidation follow the iterable's own contract. Wrappers and iterators use ordinary managed heap quotas.

Checks whether this collection contains an element equal to element.

Checks whether this iterable has an element equal to element.

Returns a list containing elements matching predicate, in their original iteration order.

Returns a list of non-null elements in their original iteration order.

Appends matching elements to destination in iteration order.

Returns the first matching element, or null when no element matches predicate.

Returns the first element, throwing NoSuchElementException when empty.

Returns the first matching element, throwing NoSuchElementException when no element matches.

Returns the first element, or null when this iterable is empty.

Returns the first matching element, or null when no element matches predicate.

Accumulates elements in iteration order.

Calls action for each element in iteration order.

Calls action for each element and its zero-based index in iteration order.

Returns the index of the first equal element, or -1 when no element matches.

Checks whether this collection has no elements.

Checks whether this collection contains at least one element.

Returns an iterator over this iterable's elements.

Returns the index of the last equal element, or -1 when no element matches.

Returns the last element, or null when this iterable is empty.

Returns the last matching element after traversing this iterable in iteration order.

Returns a list containing transform applied once to each element in iteration order.

Applies transform once per element in iteration order and retains only non-null results.

Appends non-null transformed elements to destination in iteration order.

Appends transformed elements to destination in iteration order.

Returns true when no element matches predicate.

Numeric accumulation traverses once in iteration order without an intermediate collection. Empty iterables return positive numeric zero. Integer arithmetic wraps at the result width; Float/Double addition retains ordinary rounding, infinities and NaN. Byte/Short widen to Int; UByte/UShort widen to UInt. Iterator failures propagate unchanged.

Sums selector once per element in iteration order, returning Double zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition retains ordinary Double rounding, infinities and NaN.

Sums selector once per element in iteration order, returning Int zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition uses ordinary wrapping Int arithmetic.

Sums selector once per element in iteration order, returning Long zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition uses ordinary wrapping Long arithmetic.

Sums selector once per element in iteration order, returning UInt zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition uses ordinary wrapping UInt arithmetic.

Sums selector once per element in iteration order, returning ULong zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition uses ordinary wrapping ULong arithmetic.