What are the key features of Dart that make it a good fit for Flutter?

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Dart was specifically chosen by the Flutter team because its design hits a sweet spot for UI development. Why Dart fits Flutter: JIT + AOT in one language — JIT enables Hot Reload, AOT compiles to native ARM for release. Almost no other modern language offers both at production quality. Strongly typed + sound null safety — fewer runtime errors; familiar to Java/Kotlin/C#/Swift devs. Garbage-collected, generational GC tuned for frame-time — no long pauses that cause jank. Single-threaded event loop with isolates — no shared memory, no race conditions in regular code. Async-first — Future , Stream , async / await are language features, not libraries. Named + optional parameters — perfect for widget constructors. Const constructors — compile-time canonicalization for performance. Compiles to JS ( dart2js ) and WASM ( dart2wasm ) for Flutter Web. Don't recite a generic feature list. The one-sentence framing that lands: **'Dart was chosen because it's one of very few languages that JIT-compiles for fast dev iteration AND AOT-compiles to native ARM for release — that duality is what makes Hot Reload + native performance possible in the same toolchain.'** Then drop two or three Flutter-relevant features: **named/optional parameters** (perfect for widget constructors), **cascade operator**, and **async/await + isolates** as first-class language features.