Language · 2011–now · Platform Wars
Dart
Google's language that found purpose as Flutter's syntax. Rare case where the UI framework rescued the language.
Why Dart stuck
Dart stuck because Flutter made cross-platform mobile credible with one codebase and hot reload. The language alone never competed with TypeScript or Kotlin for mindshare. Adoption follows Flutter job posts; admiration follows widget trees.

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Related
Framework · 2017–now
Flutter
Paint your own pixels on iOS and Android from one codebase. Google's bet against native UI fragmentation.
Language · 2012–now
TypeScript
JS with a typechecker that conquered the ecosystem — then a native Go compiler that made `tsc` an order of magnitude faster. The rare fad that became the floor.
Language · 2011–now
Kotlin
Java without the boilerplate ceremony. Google's Android pick and Spring's polite nod kept it climbing.