DHUCollectionsExtensions<T> extension
Methods
-
all(Predicate<T>? predicate)
→ bool
-
Returns
true if all elements match the given predicate.
Example:
5, 19, 2.all(isEven), isFalse)
6, 12, 2.all(isEven), isTrue)
-
any(Predicate<T> predicate)
→ bool
-
Returns
true if at least one element matches the given predicate.
-
concatWithMultipleList(List<Iterable<T>> iterables)
→ List<T>
-
Return a list concatenates the output of the current list and multiple
iterables
-
concatWithSingleList(Iterable<T> iterable)
→ List<T>
-
Return a list concatenates the output of the current list and another
iterable
-
containsAll(Iterable<T> collection)
→ bool
-
Checks if all elements in the specified
collection are contained in
this collection.
-
count([Predicate<T>? predicate])
→ int
-
Return a number of the existing elements by a specific predicate
example:
final aboveTwenty =
User(33, "chicko"),
User(45, "ronit"),
User(19, "amsalam"),
.count((user) => user.age > 20); // 2
-
distinctBy(Predicate<T> predicate)
→ List<T>
-
Returns a list containing only the elements from given collection having distinct keys.
-
drop(int n)
→ List<T>
-
Returns a list containing all elements except first
n elements.
-
filter(Predicate<T> test)
→ List<T>
-
Returns a list containing only elements matching the given
predicate.
-
filterNot(Predicate<T> test)
→ List<T>
-
Returns a list containing all elements not matching the given
predicate and will filter nulls as well.
-
find(Predicate<T> predicate)
→ T?
-
Returns the first element matching the given
predicate, or null
if element was not found.
-
firstHalf()
→ List<T>
-
-
forEachIndexed(void action(T element, int index))
→ void
-
Performs the given action on each element on iterable, providing sequential index with the element.
item the element on the current iteration
index the index of the current iteration
-
getRandom()
→ T
-
-
groupBy<T, K>(K key(T e))
→ Map<K, List<T>>
-
Groups the elements in values by the value returned by key.
-
intersect(Iterable<T> other)
→ Set<T>
-
Returns a set containing all elements that are contained
by both this set and the specified collection.
-
mapList<E>(E f(T e))
→ List<E>
-
-
orEmpty()
→ Iterable<T>
-
Returns this Iterable if it's not
null and the empty list otherwise.
-
secondHalf()
→ List<T>
-
-
sortedDescending()
→ List<T>
-
Returns a new list with all elements sorted according to descending
natural sort order.
-
subtract(Iterable<T> other)
→ dynamic
-
Returns a set containing all elements that are contained by this collection
and not contained by the specified collection.
The returned set preserves the element iteration order of the original collection.
-
swap(int i, int j)
→ List<T>
-
returns a list with two swapped items
i first item
j second item
-
takeOnly(int n)
→ List<T>
-
Returns a list containing first
n elements.
-
toMutableSet()
→ Set<T>
-
Convert iterable to set
-
whereIndexed(IndexedPredicate<T> predicate)
→ Iterable<T>
-
Will retrun new Iterable with all elements that satisfy the predicate
predicate,
