Javascript Exercises

1 - Event Loops / Timers / Promises vs Observables / Event Emitters

1- Event LOOP => (CallStack => Micro Tasks => Macro Tasks)

EVENT LOOP JAVASCRIPT

1st Scope => Call CallStack 
( synchhrounous functions LIFO Last in First out )
-- Inversion of control

2nd Scope => Microtasks ( Here is where the browser stops )

(process.nextTick, Promises ES6 , Object.observe, MutationObserver, async await ES8)

3rd Scope => Macro Tasks ( Here is the last scope to be executed )
( tTimeout, setInterval, setImmediate, requestAnimationFrame, I/O, UI rendering )

EVENT LOOP NODEJS

                               INTERVAL BETWEEN ANY OF THESE PHASES =>
1st Expired timer callbacks                     |          
2nd I/O Polling and callbacks                   |           => Process.nextTick             
3rd SetImmediate                                |           => Other Microtasks ( Resolved Promises)
4th Close callbacks                             |