Why does my function that calls an API or launches a coroutine return an empty or null value?

javaandroidkotlinfirebasegoogle-cloud-firestore
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How to return a DocumentSnapShot as a result of a method?

javaandroidfirebasegoogle-cloud-firestore
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Speed up fetching posts for my social network app by using query instead of observing a single event repeatedly

iosswiftfirebase
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Firebase Query Double Nested

firebasefirebase-realtime-database
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How to handle notification when app in background in Firebase

androidfirebasefirebase-cloud-messaging
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strftimegoogle-chrome-apppoint-in-polygonandroid-viewpandas-locheaderserver-sidegit-pullfopenwebkitclasspathcross-browsersql-server-group-concatsoapobjective-crenamesignalsaddsymbolicateintentfilter