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Synchronous Vs Asynchronous

Synchronous:


  • Blocking, single-threaded
  • only one operation can progress at a time
  • code is executed sequentially from top to bottom, blocking on long running tasks such as network req. and disk I/O.
  • result wait and execute sequentially.
  • Highly readable code
  • easy to implement logic
  • cost effective, convenient
  • strictly technology based, demandes high speed internet, internet connection, local time barriers, requires careful planning.
  • eg: php, java, python

Asynchronous

  • Normal js which has some ajax calls which dynamically load data from server without affecting the current flow of execution.
  • no wait for result and execute sequentially.
  • using asynchronous js (such as callbacks, promises and async/wait), you can perform long network req. without blocking the main thread.
  • fast execution
  • eg: reactive programming
  • hard to implement logic
  • eg: javascript, typescript
  • no result wait so hard to handle result
  • asynchronous result handle (use callback, promise, observable)
  • async/await treat js async function as a sync function.

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