Rendering: Re-render the UI and loop back to step 2.Microtask processing: Select the first Microtask in the Microtask Queue and run it until the Call Stack is empty, repeating until the Microtask Queue is empty.Task processing: Select the first Task in the Task Queue and run it until the Call Stack is empty.Script evaluation: Synchronously executes the script until the Call Stack is empty.It processes Tasks and Microtasks, by placing them in the Call Stack one at a time and also controls the rendering process. Microtasks and the Microtask Queue are also referred to as Jobs and the Job Queue.įinally, the Event Loop is a loop that keeps running and checks if the Call Stack is empty. Examples of Microtasks include Promise callbacks and MutationObserver callbacks. Microtasks differ from Tasks, however, in that the Microtask Queue must be emptied out after a Task completes and before re-rendering.
Additionally, they are stored in their own FIFO (First In, First Out) data structure, the Microtask Queue.
#Cliclick loop script code#
Microtasks are similar to Tasks in that they're scheduled, synchronous blocks of code with exclusive access to the Call Stack while executing. Examples of Tasks include the callback function of an event listener associated with an event and the callback of setTimeout(). The Task Queue, in turn, is a FIFO (First In, First Out) data structure. Tasks are stored in the Task Queue, waiting to be executed by their associated functions. Between Tasks, the browser can perform rendering updates. While executing, they have exclusive access to the Call Stack and can also enqueue other tasks. Tasks are scheduled, synchronous blocks of code.
The function bar() is executed and popped off the Call Stack.The function bar() is pushed onto the Call Stack.The function console.log('foo') is executed and popped off the Call Stack.The function console.log('foo') is pushed onto the Call Stack.The function foo() is executed and popped off the Call Stack.The function foo() is pushed onto the Call Stack.
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