The element currently at the back of the queue, or null if the queue is empty.

The first element returned by the iterator, if any, or null if this stream is empty. For a stream with an unstable iteration order, a different value might be produced each time first is evaluated.

The element currently at the front of the queue, or null if the queue is empty.

The hash value of the value, which allows the value to be an element of a hash-based set or key of a hash-based map. Implementations must respect the constraint that:

• if x==y then x.hash==y.hash.

Therefore, a class which refines equals must also refine hash.

Because the Integer type is platform-dependent a compiler for a given platform is permitted to further manipulate the calculated hash for an object, and the resulting hash may differ between platforms.

The last element returned by the iterator, if any, or null if this stream is empty. In the case of an infinite stream, this operation never terminates; furthermore, this default implementation iterates all elements, which might be very expensive.

The index of the last element of the list, or null if the list is empty. Always size>0 then size-1.

The number of elements returned by the iterator of this stream, if the iterator terminates. In the case of an infinite stream, this operation never terminates.

The element currently at the top of the stack, or null if the stack is empty.

Remove and return the element at the front of the queue.

Add the given element to the end of this list, incrementing the length of the list.

Add the given elements to the end of this list, increasing the length of the list.

Determines if there is at least one element of this stream that satisfies the given predicate function (selecting). If the stream is empty, returns false. For an infinite stream, this operation might not terminate.

Remove every element from this list, leaving an empty list with no elements.

A shallow copy of this collection, that is, a collection with identical elements which does not change if this collection changes. If this collection is immutable, it is acceptable to return a reference to this collection. If this collection is mutable, a newly instantiated collection must be returned.

Produce a new sequence (Sequential) containing the results of applying the given mapping (collecting) to the elements of this stream.

This operation is an eager counterpart to map. For any stream it, and mapping f:

it.collect(f) == [*it.map(f)]

Returns true if the given value belongs to this Category, that is, if it is an element of this Category, or false otherwise.

For most Categorys the following relationship is satisfied by every pair of elements x and y:

• if x==y, then x in category == y in category

However, it is possible to form a useful Category consistent with some other equivalence relation, for example ===. Therefore implementations of contains() which do not satisfy this relationship are tolerated.

Produces the number of elements in this stream that satisfy the given predicate function (selecting). For an infinite stream, this method never terminates.

Determines if there is a value defined for the given key.

Remove the element at the specified index, returning the removed element, if any, or null if there was no such element.

Remove every element with an index in the measured range from:length.

Remove every element with an index in the spanned range from..to.

Call the given function (step) for each element of this stream, passing the elements in the order they occur in this stream.

For example:

words.each((word) {
    print(word.lowercased);
    print(word.uppercased);
});

Has the same effect as the following for loop:

for (word in words) {
    print(word.lowercased);
    print(word.uppercased);
}

For certain streams this method is highly efficient, surpassing the performance of for loops on the JVM. Thus, each() is sometimes preferred in highly performance-critical low-level code.

Determine if two values are equal. Implementations should respect the constraints that:

• if x===y then x==y (reflexivity),
• if x==y then y==x (symmetry),
• if x==y and y==z then x==z (transitivity).

Furthermore it is recommended that implementations ensure that if x==y then x and y have the same concrete class.

A class which explicitly refines equals() is said to support value equality, and the equality operator == is considered much more meaningful for such classes than for a class which simply inherits the default implementation of identity equality from Identifiable.

Determines if all elements of this stream satisfy the given predicate function (selecting). If the stream is empty, return true. For an infinite stream, this operation might not terminate.

The first element of this stream which satisfies the given predicate function (selecting), if any, or null if there is no such element. For an infinite stream, this method might not terminate.

For example, the expression

(-10..10).find(Integer.positive)

evaluates to 1.

The last element of this stream which satisfies the given predicate function (selecting), if any, or null if there is no such element. For an infinite stream, this method will not terminate.

For example, the expression

(-10..10).findLast(3.divides)

evaluates to 9.

The first index in this list for which the element is not null and satisfies the given predicate function (selecting).

The indexth element returned by an iterator of this stream, or null if there are fewer than index+1 elements in the stream. For a stream with an unstable iteration order, a different value might be produced each time getFromFirst(index) is called for a given integer index.

Replace all null values in this list with the given replacement value.

Insert the given element at the specified index, incrementing the length of the list.

Insert the given elements at the specified index, growing the length of the list by the number of given elements.

An iterator for the elements belonging to this stream.

The last index in this list for which the element is not null and satisfies the given predicate function (selecting).

Obtain a measure containing the mapped values starting from the given starting index (from), with the given length. If length<=0, the resulting measure is empty.

The measure should contain the given number (length) of elements of this stream, starting from the element at the given starting index (from), in the same order as they are produced by the iterator of the stream. In the case where the iterator would be exhausted before length elements are produced, the resulting measure contains only those elements which were produced before the iterator was exhausted, and the length of the measure is less then the given length.

When the given index does not belong to this ranged object, the behavior is implementation dependent.

Add a new element to the back of the queue.

Remove and return the element at the top of the stack.

Remove all null elements from this list, leaving a list with no null elements.

Push a new element onto the top of the stack.

Beginning with the first element of this stream, apply the given combining function (accumulating) to each element of this stream in turn, progressively accumulating a single result.

For an empty stream, reduce() always returns null.

For a stream with one element, reduce() returns that element:

{ first }.reduce(f) == first

For a given stream it with more than one element, and combining function f, the result of reduce() is obtained according to the following recursive definition:

it.reduce(f) == f(it.exceptLast.reduce(f), it.last)

For example, the expression

(1..100).reduce(plus)

results in the integer 5050.

Remove all occurrences of the given value from this list, returning the number of elements removed.

To remove just one occurrence of the given value, use ListMutator.removeFirst() or ListMutator.removeLast().

Remove all occurrences of every one of the given values from this list, returning the number of elements removed.

Remove the first occurrence of the given value from this list, if any, returning true if the value occurs in the list, or false otherwise.

Remove the last occurrence of the given value from this list, if any, returning true if the value occurs in the list, or false otherwise.

Replace all occurrences of the given value in this list with the given replacement value.

To replace just one occurrence of the given value, use ListMutator.replaceFirst() or ListMutator.replaceLast().

Replace the first occurrence of the given value in this list, if any, with the given replacement value, returning true if the value occurs in the list, or false otherwise.

Replace the last occurrence of the given value in this list, if any, with the given replacement value, returning true if the value occurs in the list, or false otherwise.

A sequence (Sequential) containing all the elements of this stream, in the same order they occur in this stream. This operation eagerly evaluates and collects every element of the stream.

Replace the existing element at the specified index with the given element.

Obtain a span containing the elements between the two given indices.

The span should contain elements of this stream, starting from the element at the given starting index (from), and ending with the element at the given ending index (to), in the same order as they are produced by the iterator of the stream, except when the ending index occurs earlier than the starting index, in which case they occur in the opposite order.

When one or both of the given indices does not belong to this ranged stream, the behavior is implementation dependent.

Obtain a span containing the elements between the given starting index (from) and the last index of this ranged object.

The span should contain elements of this stream, starting from the element at the given starting index (from), in the same order as they are produced by the iterator of the stream.

When the given index does not belong to this ranged stream, the behavior is implementation dependent.

Obtain a span containing the elements between the first index of this ranged stream and given end index (to).

The span should contain elements of this stream, up to the element at the given ending index (to), in the same order as they are produced by the iterator of the stream.

When the given index does not belong to this ranged stream, the behavior is implementation dependent.

Truncate this list to the given size by removing elements from the end of the list, if necessary, to leave a list with at most the given size.