public class GroovyCollections extends Object
A Collections utility class
Type Params | Return Type | Name and description |
---|---|---|
public static List |
combinations(Object[] collections) Finds all combinations of items from the given collections. | |
public static List |
combinations(Collection collections)
| |
public static List |
combinations(Iterable collections) Finds all combinations of items from the given Iterable aggregate of collections. | |
<T> | public static List<List<T>> |
inits(Iterable<T> collections) |
<T> | public static T |
max(T[] items) Selects the maximum value found in an array of items, so min([2, 4, 6] as Object[]) == 6. |
<T> | public static T |
max(Collection<T> items)
|
<T> | public static T |
max(Iterable<T> items) Selects the maximum value found in an Iterable. |
<T> | public static T |
min(T[] items) Selects the minimum value found in an array of items, so min([2, 4, 6] as Object[]) == 2. |
<T> | public static T |
min(Collection<T> items)
|
<T> | public static T |
min(Iterable<T> items) Selects the minimum value found in an Iterable of items. |
<T> | public static Set<List<T>> |
subsequences(List<T> items) Finds all non-null subsequences of a list. |
public static Object |
sum(Object[] items) Sums all the items from an array of items. | |
public static Object |
sum(Collection items)
| |
public static Object |
sum(Iterable items) Sums all the given items. | |
<T> | public static List<List<T>> |
tails(Iterable<T> collections) |
public static List |
transpose(Object[] lists) Transposes an array of lists. | |
public static List |
transpose(List lists) Transposes the given lists. |
Methods inherited from class | Name |
---|---|
class Object | wait, wait, wait, equals, toString, hashCode, getClass, notify, notifyAll |
Finds all combinations of items from the given collections.
collections
- the given collectionscollections
- the given collections Finds all combinations of items from the given Iterable aggregate of collections. So, combinations([[true, false], [true, false]])
is [[true, true], [false, true], [true, false], [false, false]]
and combinations([['a', 'b'],[1, 2, 3]])
is [['a', 1], ['b', 1], ['a', 2], ['b', 2], ['a', 3], ['b', 3]]
. If a non-collection item is given, it is treated as a singleton collection, i.e. combinations([[1, 2], 'x'])
is [[1, 'x'], [2, 'x']]
. If an empty collection is found within the given collections, the result will be an empty list.
collections
- the Iterable of given collectionsSelects the maximum value found in an array of items, so min([2, 4, 6] as Object[]) == 6.
items
- an array of itemsSelects the maximum value found in an Iterable.
items
- a CollectionSelects the minimum value found in an array of items, so min([2, 4, 6] as Object[]) == 2.
items
- an array of itemsSelects the minimum value found in an Iterable of items.
items
- an Iterable Finds all non-null subsequences of a list. E.g. subsequences([1, 2, 3])
would be: [[1, 2, 3], [1, 3], [2, 3], [1, 2], [1], [2], [3]]
items
- the List of itemsSums all the items from an array of items.
items
- an array of itemsSums all the given items.
items
- an Iterable of itemsTransposes an array of lists.
lists
- the given lists Transposes the given lists. So, transpose([['a', 'b'], [1, 2]])
is [['a', 1], ['b', 2]]
and transpose([['a', 'b', 'c']])
is [['a'], ['b'], ['c']]
.
lists
- the given lists
© 2003-2020 The Apache Software Foundation
Licensed under the Apache license.
https://docs.groovy-lang.org/3.0.7/html/gapi/groovy/util/GroovyCollections.html