public function testMap()
{
$this->properties->map(function ($key, $item) {
return "mapped_" . $item;
});
$this->assertEquals(['foo1' => 'mapped_bar1', 'foo2' => 'mapped_bar2'], $this->properties->toArray());
}
public function test_letter_frequency()
{
$words = new Map(['aardvark', 'roads', 'sparks']);
$freqs = $words->map(function ($word) {
return new MapOfInts(count_chars($word, 1));
})->reduce(function ($totals, $counts) {
return $totals->translate($counts);
}, new MapOfInts())->rekey('chr($_1)');
$this->assertSame(['a' => 5, 'd' => 2, 'k' => 2, 'r' => 4, 'v' => 1, 'o' => 1, 's' => 3, 'p' => 1], $freqs->toArray());
}