Rx - Difference Hot and Cold observer

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Hot: If observerable start emitting items as soon as created, it is called "Hot"
Cold: Observerable will start to emit items when it is subscribed.

Java - JFR create a new configuration from existing one

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Creating a new custom(custom.jfc) JFR configuration from the existing profile.jfc

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Nice example how Javascript can have a unit test with fetch call by mocking.

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Signal will be standard in JavaScript?

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LangChain JS example with Llama cpp for embeddings and prompt.