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Event Loop ↔ (mechanism) to orchestrate Non-Blocking Concurrency Model by manageCallback Functions between Callback Queue& Call Stack, to await execute

Microtask​

Callback to defer fn after parent EC popped off Call Stack

Microtasks Queue​

used to queue async promises, to defer execute until Call Stack empty

Source: developer.mozilla.org/en

Task​

Callback in Task Queue to execute sequentially at Tick start until empty. Can enqueue more ♾ & execute in same Tick!

Task Queue

Tick​

Each Event Loop cycle iteration

References​

  1. Browser Runtime ↔ JS Runtime Environ with JS Engine, Web API, Callback Queue & Event Loop

  2. Concurrency Model ↔ (mechanism) to achieve Concurrency for JS Engine via Event Loop, Callback Queue & Callback Function

  3. JS Engine ↔ Program to execute JS Source Code, consists of Call Stack, Heap, Callback Queue & Event Loop

  4. Tick ↔ Each Event Loop cycle iteration