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.

Comments

NodeJS: Request and Respose Objects

# req Objects - req - req.body, req.queries, req.validationerrors - res.headers, req.users, req.file, req.assert - req.params, req.checkbody #res Objects - res.send, res.end, res.json, res.render, res.status, res.sendStatus # - .limit(4) //limit only upto 4 docs - skips(3) //skip first 3 docs - exe //query build and then execute, it is also callback function of mongoose. - sort({_id: -1}) //for decending order - populate('userId') //populating data inside the reference.

Javascript: Object to Array and Array to Object

Output: Final Array [ { mango: 1 }, { apple: 2 }, { banana: 3 }, { orange: 1 }, { watermelon: 1 }, { papaya: 1 } ] Output: Final Object { mango: 1, apple: 2, banana: 3, orange: 1, watermelon: 1, papaya: 1 }

Github Tutorial

GitHub brings together the world's largest community of developers to discover, share, and build better software. Delivered through software as a service(SAAS) business model 2008 by linus (Owner: Microsoft) #Create New Repository in Github New Repository Add Repository Name and description Public / Private, initialize this repo with Read Me Create repository create a new repository on the command line echo "#test" >> README.md git init git add README.md git commit -m "first commit" git remote add origin https://github.com/sinuna/test.git git push -u origin master …or push an existing repository from the command line git remote add origin https://github.com/sinuna/firstRepository.git git push -u origin master …or import code from another repository You can initialize this repository with code from a Subversion, Mercurial, or TFS project. Initialize Repo $ git init Clone Repo $ git clone https://github.com...

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