October 2015 - MAD Blog

Getting whatsapp statistics – WhatsappWeb

There are no tool available for whatsapp which give us how many messages a user has contributed to group, Sometimes you need.

Whatsapp web exposes whatsapp to JS, whiche makes things more easy,
I wrote a simple code which logs Number of messages sent by each user of group, obviously you need full conversation open in web, You can use Home Key to do that,

The code was written in few minutes so it doesn’t have proper validations or automation,

But is good for purpose.
Open whatsappWeb and after opening complete conversation of group execute the following code in Google Chrome – Developer Console

var v = document.querySelectorAll('.msg.msg-group .text-clickable');
var t, count ={};
for(var i=0,l=v.length;i<l;++i){
t = v[i].textContent.trim();
 if(typeof count[t]=== 'undefined')
	count[t]=0;
 ++count[t];
}

console.log(count);

var v = document.querySelectorAll('.msg.msg-group .text-clickable');

var t, count ={};

for(var i=0,l=v.length;i<l;++i){

t = v[i].textContent.trim();

if(typeof count[t]=== 'undefined')

count[t]=0;

++count[t];

}

console.log(count);

Redis Vs MongoDB

Redis and Mongodb are considered to solve a common problem that “There is something wrong with RDBMS”
So what is difference ?

Redis is stored in memory and swapped with disk, So data is not lost and you can enjoy performance of your RAM. (Not to be confused with Memcached it is memory only database) whereas Mongodb is disk only database.
Redis can store many type of object strings, hashes, lists, sets, sorted sets whereas Mongo can only store key value pair in form of document (mongo is schemaless).
Redis is hard to learn whereas mongo is easier to understand and get started.
Redis has no support for clustering (Clustering support has been added since version 3.0) whereas mongo has inbuilt clustering support.

Why not nodejs v4.1.1

Recently i updated nodejs installation to v4.1.1 using

curl -sL https://deb.nodesource.com/setup_4.x | sudo -E bash -
sudo apt-get install -y nodejs

1 2	curl -sL https://deb.nodesource.com/setup_4.x \| sudo -E bash - sudo apt-get install -y nodejs

and i ended up fixing many bug in other modules, but i couldn’t move far in this decision.

Nodejs has a history of breaking compatibility with older code in every new release, so if you have project with multiple dependencies don’t upgrade you nodejs version to latest, Instead use NVM to test your code for compatibility in different versions.