println('Example 1');
\Rx\Observable::fromArray([1, 2, 3, 4])->subscribe(new \Rx\Observer\CallbackObserver(function ($x) {
echo 'Next: ', $x, PHP_EOL;
}, function (Exception $ex) {
echo 'Error: ', $ex->getMessage(), PHP_EOL;
}, function () {
echo 'Completed', PHP_EOL;
}));
println('Example 2 Reduce Map Filter with Curry');
$isEven = function ($num) {
return $num % 2 === 0;
};
$add = function ($x, $y) {
return $x + $y;
};
$raiseTo = function ($power, $num) {
return pow($num, $power);
};
$computeSquare = P::curry2($raiseTo)(2);
\Rx\Observable::fromArray([1, 2, 3, 4])->filter($isEven)->map($computeSquare)->reduce($add, 0)->subscribe($stdoutObserver());
//-> 20
println('Example 3 - Map');
\Rx\Observable::fromArray([1, 2, 3, 4])->map(function ($num) {
return $num * $num;
})->subscribe(new \Rx\Observer\CallbackObserver(function ($x) {
echo 'Next: ', $x, PHP_EOL;
}, function (Exception $ex) {
echo 'Error: ', $ex->getMessage(), PHP_EOL;
}, function () {
echo 'Completed', PHP_EOL;
}));
public function testCurry2()
{
$sum2 = function ($a, $b) {
return $a + $b;
};
$curriedSum2 = P::curry2($sum2);
$addToFive = $curriedSum2(5);
$this->assertEquals(8, $addToFive(3));
$this->assertEquals(8, $curriedSum2(3, 5));
}
$applyTax(6.0);
//-> Closure
$applyTax(6.0, 100);
//-> 106
$applyTax(6.0)(100);
//-> 106
// $total = P::compose($currency('USD'), $applyTax(6.0), 'P::sum');
// $total([10.95, 16.99, 25.99]); //-> USD 57.1658
// function findUserById($id) {
// //...
// return Option::fromValue($user);
// }
// $userOpt = Option::fromValue(findUserById(10)); //-> Option(Option(User))
// $userOpt->flatMap(P::prop('address'))->map(P::prop('country'))->get();
$a = function () {
(yield 1);
(yield 3);
};
$modulo = function ($number) {
return $number % 2;
};
$modded = P::toArray(P::map($modulo, $a()));
print_r($modded);
// composition with currying
$input = 'A complex system that works is
invariably found to have evolved
from a simple system that worked';
$explodeOnSpace = P::curry2('explode')(' ');
$countWords = P::compose('count', $explodeOnSpace);
$countWords($input);
//-> 17
