PHP | DsMap reverse() Function

PHP | Ds\Vector reduce() Function

Last Updated : 22 Aug, 2019

The Ds\Vector::reduce() function is an inbuilt function in PHP which reduce the vector to a single value by applying operations in the callback function. Syntax:

mixed  public Ds\Vector::reduce( $callback, $initial )

Parameters: This function accepts two parameters as mentioned above and described below:

$callback: This parameter holds the function which contains the operation on the elements and store carry. This callback function contains two arguments, carry and value, where carry is the value returned by the function and value is the value of the element at the current iteration.
$initial: This parameter holds the initial value of carry, which can be NULL.

Return Value: This function returns the final value returned by the callback function. Below programs illustrate the Ds\Vector::reduce() function in PHP: Program 1:

PHP

<?php

// Declare new Vector
$vect = new \Ds\Vector([1, 2, 3, 4, 5]);

echo("Vector Elements\n");

print_r($vect);

// callback function with reduce function
echo("\nElement after performing operation\n");
var_dump($vect->reduce(function($carry, $element) {
    return $carry + $element + 2;
}));

?>

Output:

Vector Elements
Ds\Vector Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

Element after performing operation
int(25)

Program 2:

PHP

<?php

// Declare new Vector
$vect = new \Ds\Vector([10, 20, 30, 40, 50]);

echo("Original vector elements\n");

print_r($vect);

$func_gfg = function($carry, $element) {
    return $carry * $element;
};

echo("\nVector after reducing to single element\n");

// Use reduce() function
var_dump($vect->reduce($func_gfg, 10));

?>

Output:

Original vector elements
Ds\Vector Object
(
    [0] => 10
    [1] => 20
    [2] => 30
    [3] => 40
    [4] => 50
)

Vector after reducing to single element
int(120000000)

Reference: http://php.net/manual/en/ds-vector.reduce.php

PHP | DsMap reverse() Function

B

barykrg

Improve

Article Tags :

Similar Reads

PHP | DsSet reduce() Function

The Ds\Set::reduce() function is an inbuilt function in PHP which is used to reduce the set to a single value by applying operations using the callback function. Syntax: mixed public Ds\Set::reduce ( callable $callback [, mixed $initial ] ) Parameters: This function accepts two parameters as mention

PHP | DsVector reduce() Function

The Ds\Vector::reduce() function is an inbuilt function in PHP which reduce the vector to a single value by applying operations in the callback function. Syntax: mixed public Ds\Vector::reduce( $callback, $initial ) Parameters: This function accepts two parameters as mentioned above and described be

PHP | DsMap reverse() Function

The Ds/Map::reverse() function in PHP is used to in-place reverse the elements of a specified Map instance. That is, the function in-place reverses the order of elements present in the specified Map instance. Syntax: Ds\Map public Ds\Map::reverse ( int $position ) Parameter: This function does not a

PHP | DsSequence reduce() Function

The Ds\Sequence::reduce() function is an inbuilt function in PHP which is used to reduce the sequence to a single value using a callback function. Syntax: mixed abstract public Ds\Sequence::reduce ( callable $callback [, mixed $initial ] ) Parameters: This function accepts two parameters as mentione

PHP array_reduce() Function

This inbuilt function of PHP is used to reduce the elements of an array into a single value that can be of float, integer or string value. The function uses a user-defined callback function to reduce the input array. Syntax: array_reduce($array, own_function, $initial) Parameters: The function takes

PHP | DsMap remove() Function

The Ds\Map::remove() function is an inbuilt function in PHP which is used to remove and return a value by key. Syntax: mixed Ds\Map::remove( $key, $default ) Parameters: This function accepts two parameters as mentioned above and described below: $key: It holds the key value which need to remove. $d

PHP | DsDeque reverse() Function

The Ds\Deque::reverse() function is an inbuilt function in PHP which is used to reverse the elements in the Deque in-place. Syntax: public Ds\Deque::reverse( void ) : void Parameters: This function does not accept any parameter. Return Value: This function does not return any value. Below programs i

PHP | DsVector reverse() Function

The Ds\Vector::reverse() function is an inbuilt function in PHP which is used to reverse the vector elements in-place. Syntax: void public Ds\Vector::reverse( void ) Parameters: This function does not accepts any parameters. Return Value: This function does not return any value. Below programs illus

PHP | DsDeque reversed() Function

The Ds\Deque::reversed() function is an inbuilt function in PHP which is used to return the copy of Deque which contains the elements in reversed order. Syntax: public Ds\Deque::reversed( void ) : Ds\Deque Parameters: This function does not accept any parameter. Return Value: This function returns a

PHP | DsVector reversed() Function

The Ds\Vector::reversed() function is an inbuilt function in PHP which is used to reverse the elements of vector after copying the elements of original vector into a copy. Syntax: public Ds\Vector::reversed( void ) : Ds\Vector Parameters: This function does not accept any parameter. Return Value: Th