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Aliases accept an unlimited number of parameters between parentheses, like a function in many languages. Start each parameter with $.
$
{#mealOf($weekday) = d[weekday = $weekday].name}
Tuesday, we eat {$mealOf(2)}.
Tuesday, we eat fish.
[ { "name": "chicken", "weekday": 1 }, { "name": "fish" , "weekday": 2 } ]