Package groovy.util
Class GroovyCollections
java.lang.Object
groovy.util.GroovyCollections
A Collections utility class
- Author:
- Paul King, Jim White
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionstatic List
combinations
(Iterable collections) Finds all combinations of items from the given Iterable aggregate of collections.static List
combinations
(Object[] collections) Finds all combinations of items from the given collections.static List
combinations
(Collection collections) Deprecated.use combinations(Iterable)static <T> T
Selects the maximum value found in an Iterable.static <T> T
max
(Collection<T> items) Deprecated.use max(Iterable)static <T> T
max
(T[] items) Selects the maximum value found in an array of items, so min([2, 4, 6] as Object[]) == 6.static <T> T
Selects the minimum value found in an Iterable of items.static <T> T
min
(Collection<T> items) Deprecated.use min(Iterable)static <T> T
min
(T[] items) Selects the minimum value found in an array of items, so min([2, 4, 6] as Object[]) == 2.subsequences
(List<T> items) Finds all non-null subsequences of a list.static Object
Sums all the given items.static Object
Sums all the items from an array of items.static Object
sum
(Collection items) Deprecated.use sum(Iterable)static List
Transposes an array of lists.static List
Transposes the given lists.
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Constructor Details
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GroovyCollections
public GroovyCollections()
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Method Details
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combinations
Finds all combinations of items from the given collections.- Parameters:
collections
- the given collections- Returns:
- a List of the combinations found
- See Also:
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subsequences
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]]- Parameters:
items
- the List of items- Returns:
- the subsequences from items
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combinations
Deprecated.use combinations(Iterable)- Parameters:
collections
- the given collections
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combinations
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]]
andcombinations([['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.- Parameters:
collections
- the Iterable of given collections- Returns:
- a List of the combinations found
- Since:
- 2.2.0
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transpose
Transposes an array of lists.- Parameters:
lists
- the given lists- Returns:
- a List of the transposed lists
- See Also:
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transpose
Transposes the given lists. So,transpose([['a', 'b'], [1, 2]])
is[['a', 1], ['b', 2]]
andtranspose([['a', 'b', 'c']])
is[['a'], ['b'], ['c']]
.- Parameters:
lists
- the given lists- Returns:
- a List of the transposed lists
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min
public static <T> T min(T[] items) Selects the minimum value found in an array of items, so min([2, 4, 6] as Object[]) == 2.- Parameters:
items
- an array of items- Returns:
- the minimum value
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min
Deprecated.use min(Iterable) -
min
Selects the minimum value found in an Iterable of items.- Parameters:
items
- an Iterable- Returns:
- the minimum value
- Since:
- 2.2.0
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max
public static <T> T max(T[] items) Selects the maximum value found in an array of items, so min([2, 4, 6] as Object[]) == 6.- Parameters:
items
- an array of items- Returns:
- the maximum value
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max
Deprecated.use max(Iterable) -
max
Selects the maximum value found in an Iterable.- Parameters:
items
- a Collection- Returns:
- the maximum value
- Since:
- 2.2.0
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sum
Sums all the items from an array of items.- Parameters:
items
- an array of items- Returns:
- the sum of the items
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sum
Deprecated.use sum(Iterable) -
sum
Sums all the given items.- Parameters:
items
- an Iterable of items- Returns:
- the sum of the item
- Since:
- 2.2.0
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