JSON

Key Points

• Parsing operations in computationally expensive operations in general should not be executed in the main thread of an application.
• Since Flutter is a single threaded framework (or has a single threaded runtime environment) it is necessary to execute the parsing operation asynchronously.
• Flutter provides the [Isolate] class for executing computationally expensive background threads
• Use the compute() function provided by Flutter to shift expensive parsing operations ot a separate background isolate.
• Isolates communicate by passing messages back and forth. These messages can be primitive values, such as null, num, bool, double, or String, or simple objects such as List<Photo>.

Recommended Learning Resources

• Learn how to parse JSON in the background of your Flutter app: https://docs.flutter.dev/cookbook/networking/background-parsing
• This guide provides an in-depth description with many code examples about how to parse JSON: https://codewithandrea.com/articles/parse-json-dart/
• Get more information about the compute() function: https://api.flutter.dev/flutter/foundation/compute.html