Set of PHP collections
This project is currently in progress !
#Set of PHP collections.
It has 4 types of collections
1 Map : Regular hashmap represented in json as {"a" => "b", "c" => 3}
2 Sequence : only numerical index represented in json as [1, 2, 3]
3 Set : Sequence with unique entries. Unlike php native array_unique, it somehow remove duplicate objects and array (to a certain extend)
4 Structure : Map with defined keys. Every keys must have a corresponding values
Each of these have their Immutable Part, ImmMap, ImmSequence, ImmSet, ImmStructure. On The immutable collections, you can NOT add, remove, or edit any entries !
#Methods
Each methods return new Collection, so NEVER a collection is altered in anyway. (unlike some PHP functions which pass array by reference)
It also implements ArrayAccess, Iterator, Countable.
filter
$map = new Map(["a" => 1, "b" => 2, "c" => 3]);
$filtered = $map->filter(function($_) {return ($_ & 1);});
echo $filtered->count(); //2
echo $filtered->get("a"); //1
echo $filtered->a; //1
echo $filtered["a"]; //1, these are equivalent way to access datafilterKey
$set = new Set([1, 2, 3]);
$filtered = $set->filterKey(function($_) {return ($_ & 1);});
echo $filtered->count(); //1
echo $filtered[0] = 2;foldLeft
$map = new Map(["a" => 1, "b" => 2, "c" => 3, "d" => 3]);
echo $map->foldLeft(function($v, $acc) {return (string) $acc . (string) $v;}); //1233foldRight
$seq = new Sequence([1, 2, 3, 4, 5]);
echo $seq->foldRight(function($v, $acc) {return $acc === null ? $v : $acc * $v;}); //120isEmpty
$seq = new Sequence([null]);
echo $seq->isEmpty()); //0
echo $seq->filter(function($i) {return $i !== null;})->isEmpty(); //1map
$struct = new Structure(["a" => 1, "b" => 2, "c" => 3], ["a", "b", "c"]);
$highLevelFunction = function($pow) {
return function($item) use ($pow) {
return pow($item, $pow);
};
};
$filtered = $struct->map($highLevelFunction(2));
echo $filtered["a"]; //1
echo $filtered["b"]; //4
echo $filtered["c"]; //9toArray