private function mapPairsBy($mapper, $mapType = 'mapBy')
{
return $this->asPairs()->{$mapType}($this->getCollectionCallbackFor($mapper))->foldBy(function ($builder, $pair) {
if ($builder instanceof CollectionBuilder) {
return $builder->add($pair);
}
// Is pair like?
if (is_array($pair) && count($pair) == 2) {
return $builder->put($pair[0], $pair[1]);
} else {
$collectionBuilder = new CollectionBuilder();
// Downgrade to collection...
return $collectionBuilder->addAll($builder->build()->asPairs())->add($pair);
}
}, static::createMapBuilder(false))->build();
}
/**
* @param array|\Traversable|mixed $data
*
* @return \Colada\Collection
*/
function to_collection($data)
{
$builder = new CollectionBuilder();
return $builder->addAll($data)->build();
}