Arrayy: A Quick Overview of map(), filter(), and reduce()

first published here: https://suckup.de/2020/07/arrayy-a-quick-overview-of-map-filter-and-reduce/

The next examples are using the php array manipulation library “Arrayy” which is using generators internally for many operations.

⇾ https://github.com/voku/Arrayy

StringCollection::create(['Array', 'Array'])->unique()->append('y')->implode(); // Arrayy

map: transform all values in the collection

StringCollection::create(['foo', 'Foo'])->map('mb_strtoupper'); 

// StringCollection['FOO', 'FOO']

filter: pass all values to the truth test

$closure = function ($value) {
    return $value % 2 !== 0;
}
IntCollection::create([1, 2, 3, 4])->filter($closure); 

// IntCollection[0 => 1, 2 => 3]

reduce: transform all values into a new result

IntCollection::create([1, 2, 3, 4])->reduce(
    function ($carry, $item) {
        return $carry * $item;
    },
    1
); 

// IntCollection[24]

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Arrayy: A Quick Overview of map(), filter(), and reduce()

Lars Moelleken

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