Вот решение, использующее forEach
:
const data = [{"date":"2018-05-31","closed":false,"meals":[{"id":3299946,"name":"Zitronenhühnchen mit Tomatenconfit, Romanesco und Rosmarinkartoffeln","category":"Angebote","prices":{"students":2.75,"employees":4.5,"pupils":null,"others":null},"notes":[]},{"id":3299947,"name":"Rote Bete-Bohnenragout mit Kartoffel-Linsenstampf","category":"Angebote","prices":{"students":2.0,"employees":3.75,"pupils":null,"others":null},"notes":["Menü ist vegan"]},{"id":3299948,"name":"Hausgemachte frische Pasta, heute Maccheroni mit Paprika und Schinken in Tomatenragout, dazu italienischer Hartkäse Grana Padano","category":"Angebote","prices":{"students":2.3,"employees":4.05,"pupils":null,"others":null},"notes":["Menü enthält Schweinefleisch"]},{"id":3354754,"name":"Pizza Kapstadt mit Wiener, Gewürzgurke und Röstzwiebeln","category":"Angebote","prices":{"students":null,"employees":null,"pupils":null,"others":null},"notes":["Menü enthält Rindfleisch","Menü enthält 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data.forEach(processDate);
function processDate(el) {
el.meals.forEach(printMeals);
}
function printMeals(el) {
console.log(el.name);
// etc.
}