public function testAppend()
{
$m1 = [1, 2, 3];
$m2 = [11, 13];
$m = mappend($m1, $m2);
$this->assertEquals([1, 2, 3, 11, 13], $m);
}
public function testAppend()
{
$m1 = 'abc';
$m2 = 'def';
$m = mappend($m1, $m2);
$this->assertEquals('abcdef', $m);
}
public function testAppend()
{
$m = new Func\Unit();
$m = mappend(new Func\Unit(), new Func\Unit());
$this->assertEquals(new Func\Unit(), $m);
$this->assertEquals(new Func\Unit(), mappend($m, mempty()));
$this->assertEquals(new Func\Unit(), mempty()->mappend(mempty())->mappend($m));
}
public static function mappend($m1, $m2)
{
assert($m1 instanceof Instance, 'First argument must be Func');
assert($m2 instanceof Instance, 'Second argument must be Func');
return f(function ($f, $g, $a) {
return mappend($f($a), $g($a));
}, $m1, $m2);
}
public static function bind($m, callable $f)
{
assert($m instanceof Instance, 'First argument must be Writer');
$inner = $f($m->a);
if ($inner instanceof \Laiz\Func\Any) {
$inner = $inner->cast($m);
}
return new Instance($inner->a, mappend($m->w, $inner->w));
}
public function testGuardAppend()
{
$f = function ($s, ...$eq) {
return f(function ($s, $a, $b) {
return fconst($s, guard($a === $b));
}, $s, ...$eq);
};
$at = $f('a', 1, 1);
$af = $f('a', 1, 2);
$bt = $f('b', 2, 2);
$bf = $f('b', 2, 3);
$this->assertEquals(Just('a'), $at->cast(Nothing()));
$this->assertEquals(Nothing(), $af->cast(Nothing()));
$this->assertEquals(Just('b'), $bt->cast(Nothing()));
$this->assertEquals(Nothing(), $bf->cast(Nothing()));
$this->assertEquals(Nothing(), mappend($af, $bf)->cast(Nothing()));
$this->assertEquals(Just('a'), mappend($at, $bf)->cast(Nothing()));
$this->assertEquals(Just('b'), mappend($af, $bt)->cast(Nothing()));
$this->assertEquals(Just('ab'), mappend($at, $bt)->cast(Nothing()));
$this->assertEquals(Nothing(), mappend($f('a', 1), $f('b', 1), 2)->cast(Nothing()));
$this->assertEquals(Just('a'), mappend($f('a', 2), $f('b', 1), 2)->cast(Nothing()));
$this->assertEquals(Just('b'), mappend($f('a', 1), $f('b', 2), 2)->cast(Nothing()));
$this->assertEquals(Just('ab'), mappend($f('a', 2), $f('b', 2), 2)->cast(Nothing()));
}
