PHP - Sequence Functions

Quiz

ASequencecan describe the behavior of values arranged in a single, linear dimension. Some languages can refer to this as a List. It is similar to an array that uses incremental integer keys, except for a few characteristics.

Following are a few important points about the sequence −

Values can always be indexed as [0, 1, 2, , size - 1].
Only allowed to access values by index in the range [0, size - 1].

Use cases

Below are the use cases of sequence −

Wherever we can use an array as a list (not concerned with keys).
A more efficient alternative to SplDoublyLinkedList and SplFixedArray.

List of Functions

Below of the list of functions provided by the the Sequence class −

Sr.No	Function & Description
1	Ds\Sequence::allocate() This Function can allocate enough memory for a required capacity.
2	Ds\Sequence::apply() This Function can update all values by applying a callback function to each value.
3	Ds\Sequence::capacity() This Function can return the current capacity.
4	Ds\Sequence::contains() This Function can determine if a sequence contains given values.
5	Ds\Sequence::filter() create a new sequence using callable to determine which values to include.
6	Ds\Sequence::find() This Function can attempt to find the value's index.
7	Ds\Sequence::first() This Function can can return the first value in a sequence..
8	Ds\Sequence::get() This Function can return the value at a given index.
9	Ds\Sequence::insert() This Function can insert values at a given index.
10	Ds\Sequence::join() This Function can join all values together as a string.
11	Ds\Sequence::last() This Function can return the last value.
12	Ds\Sequence::map() This Function can return the result of applying a callback to each value.
13	Ds\Sequence::merge() This Function can return the result of adding all given values to the sequence.
14	Ds\Sequence::pop() This Function can remove and return the last value.
15	Ds\Sequence::push() This Function can add values to the end of a sequence.
16	Ds\Sequence::reduce() This Function can reduce the sequence to a single value using a callback function.
17	Ds\Sequence::remove() This Function can remove and return a value by index.
18	Ds\Sequence::reverse() This Function can can reverse a sequence in-place.
19	Ds\Sequence::reversed() This Function can return a reversed copy.
20	Ds\Sequence::rotate() This Function can rotate the sequence by given number of rotations.
21	Ds\Sequence::set() This Function can update a value at the given index.
22	Ds\Sequence::shift() This Function can remove and return a first value.
23	Ds\Sequence::slice() This Function can return a sub-sequence of the given range.
24	Ds\Sequence::sort() This Function can sort a sequence in-place.
25	Ds\Sequence::sorted() This Function can return a sorted copy.
26	Ds\Sequence::sum() This Function can return the sum of all values in a sequence.
27	Ds\Sequence::unshift() This Function add values to the front of a sequence.

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