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Questions and Answers
What happens when a message is removed from the queue?
What happens when a message is removed from the queue?
- The message is discarded
- Its corresponding function is called with the message as an input parameter (correct)
- The message is moved to the end of the queue
- Its corresponding function is called without the message as an input parameter
When does a JavaScript runtime start handling the messages on the queue?
When does a JavaScript runtime start handling the messages on the queue?
- Randomly during the event loop
- At the end of the event loop
- At the beginning of the event loop (correct)
- Only when the stack is empty
What creates a new stack frame for a function's use?
What creates a new stack frame for a function's use?
- Calling a function (correct)
- Creating a message on the queue
- Processing functions until the stack is empty
- Removing a message from the queue
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Study Notes
- A JavaScript runtime manages messages using a message queue, which functions as a list of messages to be processed.
- Each message in the queue is associated with a specific function that gets called to handle the message.
- The runtime begins processing messages in the queue by removing the oldest message and invoking its corresponding function.
- The function call creates a new stack frame for its use during processing.
- The event loop continues handling messages in this manner until the stack is empty.
- Once the stack is empty, the event loop moves on to the next message in the queue (if one exists).
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