public function testWithReturnsPlinqWrapper()
{
$input = [1];
$expected = 'plinq\\plinqWrapper';
$actual = plinq::with($input);
$this->assertInstanceOf($expected, $actual);
}
public function testReturnsDistinctValuesFromExpressionIfProvided()
{
$input = ["a", "A", "b", "B"];
$expected = ["a", "b"];
$expression = function ($k, $v) {
return strtolower($v);
};
$actual = plinq::with($input)->distinct($expression)->toArray();
$this->assertEquals($expected, $actual);
}
return strtolower($v->genre) == "fantasy";
});
print "There are {$numFantasyBooks} fantasy books \r\n";
print "\r\n";
// Calculate the price of all romance books
print "==== The price of all romance books ==== \r\n";
$sumAggregate = function ($acc, $k, $v) {
return $acc + floatval($v->price);
};
$priceOfRomanceBooks = plinq::with($books)->where(function ($v) {
return strtolower($v->genre) == "romance";
})->aggregate(0.0, $sumAggregate);
print "The price of all romance books is {$priceOfRomanceBooks} \r\n";
print "\r\n";
// Calculate the price of all genres of book
print "==== The price of each genre book ==== \r\n";
$allPrices = plinq::with($books)->distinct(function ($k, $v) {
return strtolower($v->genre);
})->aggregate(array(), function ($acc, $k, $v) use($books, $sumAggregate) {
if (!array_key_exists($v, $acc)) {
// Find the sum of the prices in this genre
$acc[$v] = plinq::on($books)->where(function ($b) use($v) {
return strtolower($b->genre) == $v;
})->aggregate(0.0, $sumAggregate);
}
return $acc;
})->toArray();
foreach ($allPrices as $g => $p) {
print "The price of all {$g} books is {$p} \r\n";
}
print "\r\n";