Created
February 7, 2013 08:59
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selectManyWith を使った filter （ただの曲芸）
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| <?php | |
| Ginq::range(1,10) | |
| ->selectManyWith( | |
| function($x) { if ($x % 2 == 0) return [null]; else return []; }, | |
| function($x) { return $x; }); | |
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別にべったりリストモナド真似なくても manySelector で [$x] か [] 返せばただの selectMany でもできるか。