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    Ds\Sequence::reduce

    (PECL ds >= 1.0.0)

    Ds\Sequence::reduce — Reduces the sequence to a single value using a callback function

    Açıklama

    abstract public Ds\Sequence::reduce(callable $callback, mixed $initial = ?): mixed

    Reduces the sequence to a single value using a callback function.

    Bağımsız Değişkenler

    callback
    callback(mixed $carry, mixed $value): mixed
    carry

    The return value of the previous callback, or initial if it's the first iteration.

    value

    The value of the current iteration.

    initial

    The initial value of the carry value. Can be null.

    Dönen Değerler

    The return value of the final callback.

    Örnekler

    Örnek 1 Ds\Sequence::reduce() with initial value example

    <?php
    $sequence     = new \Ds\Vector([1, 2, 3]);

    $callback = function($carry, $value) {
    return     $carry * $value;
    };

    var_dump($sequence->reduce($callback, 5));

    // Iterations:
    //
    // $carry = $initial = 5
    //
    // $carry = $carry * 1 = 5
    // $carry = $carry * 2 = 10
    // $carry = $carry * 3 = 30
    ?>

    Yukarıdaki örnek şuna benzer bir çıktı üretir:

    int(30)

    Örnek 2 Ds\Sequence::reduce() without an initial value example

    <?php
    $sequence     = new \Ds\Vector([1, 2, 3]);

    var_dump($sequence->reduce(function($carry, $value) {
    return     $carry + $value + 5;
    }));

    // Iterations:
    //
    // $carry = $initial = null
    //
    // $carry = $carry + 1 + 5 = 6
    // $carry = $carry + 2 + 5 = 13
    // $carry = $carry + 3 + 5 = 21
    ?>

    Yukarıdaki örnek şuna benzer bir çıktı üretir:

    int(21)
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