_{Jamie Balfour's}Personal blog

Arrow expressions are another new feature coming to ZPE 1.14.4. They make light work of simple expressions:

$x = [11, 34, 55, 66, 74, 87, 93, 102]
print($x.where(n => n % 2 == 0))

And for maps:

$x = ["a" => 11, "b" => 34, "c" => 55, "d" => 66, "e" => 74, "f" => 87, g" => 93, "h" => 102]
print($x.where(key, value => value > 40))

These new expressions are designed to simplify statements that would normally require a lambda function:

$x = [11, 34, 55, 66, 74, 87, 93, 102]
print($x.where(n => function ($n) { return $n % 2 == 0}))

Underneath, arrow expressions are actually running a lambda function themselves, but the syntax is simpler and easier on the eye than a lambda function.