June 2019
Intermediate to advanced
746 pages
17h 2m
German
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10.2.9Flattening-Strategien für Higher-Order Observables
Zum Abschluss dieses Kapitels wollen wir uns einem Thema widmen, das sich hinter dem akademisch anmutenden Begriff der Higher-Order Observables versteckt. Dazu modellieren wir einen kleinen Anwendungsfall: Wir haben ein Observable, das einen HTTP-Request ausführt, z. B. mit dem HttpClient von Angular. Wir wollen darauf allerdings nicht nur einmal subscriben, sondern immer dann, wenn ein anderes Observable uns dafür ein Signal gibt. Stellen Sie sich vor, Sie wollen die Daten vom HTTP-Server periodisch abfragen, oder Sie horchen auf ein Event und wollen zu jedem Event einen Request ausführen.
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