Explain Flutter isolates and concurrent programming.

Flutter isolates and concurrency:\n\n**Isolate Concepts:**\n• Independent memory heaps\n• No shared memory between isolates\n• Communication via message passing\n• Each isolate has own event loop\n\n**Creating Isolates:**\n\nimport 'dart:isolate';\n\n// Heavy computation function\nvoid heavyComputation(SendPort sendPort) {\n // Perform heavy task\n int result = 0;\n for (int i = 0; i < 1000000; i++) {\n result += i;\n }\n sendPort.send(result);\n}\n\n// Main isolate\nFuture runHeavyTask() async {\n final receivePort = ReceivePort();\n await Isolate.spawn(heavyComputation, receivePort.sendPort);\n return await receivePort.first;\n}\n\n\n**Using compute() Function:**\n\nint heavyTask(int number) {\n // Heavy computation\n return number * number;\n}\n\nFuture performTask() async {\n final result = await compute(heavyTask, 1000);\n print('Result: $result');\n}\n\n\n**Communication Patterns:**\n• **One-way** - Send data, no response\n• **Request-Response** - Send data, wait for response\n• **Bidirectional** - Continuous communication\n\n**Use Cases:**\n• Image processing\n• JSON parsing\n• Cryptographic operations\n• File I/O operations\n• Network requests\n\n**Best Practices:**\n• Use compute() for simple tasks\n• Create custom isolates for complex scenarios\n• Minimize data transfer between isolates\n• Handle isolate lifecycle properly