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Javascript how to display the number of users depending on what month they are created

I want to display the number of users based on what month they are created. As an example, I gave the following data:

[ 
  { name: 'user1', created: 'may' },
  { name: 'user2', created: 'may' },
  { name: 'user3', created: 'may' },
  { name: 'user4', created: 'may' },
  { name: 'user5', created: 'june' },
  { name: 'user6', created: 'june' },
  { name: 'user7', created: 'august' },
  { name: 'user8', created: 'august' },
  { name: 'user9', created: 'august' } 
]

what i want to achieve is to show them like this:

may: 4
june: 2
august: 3

How can i do this?

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4 answers


You can use reduce()

and return an object as a result.



var data = [{"name":"user1","created":"may"},{"name":"user2","created":"may"},{"name":"user3","created":"may"},{"name":"user4","created":"may"},{"name":"user5","created":"june"},{"name":"user6","created":"june"},{"name":"user7","created":"august"},{"name":"user8","created":"august"},{"name":"user9","created":"august"}]

var result = data.reduce(function(r, e) {
  return r[e.created] = (r[e.created] || 0) + 1, r
}, {})

console.log(result)
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I think this will give you an idea:

const usersCreatedInMay = users.filter(u => u.created == 'may')

usersCreatedInMay

will return null

or array

. Just view its length to see how many users have been created in the bank.



usersCreatedInMay.length

You can view all months and calculate how many users are created in each month.

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You can try something that goes in this direction, the code may not work as it is not tested.

function extract(month, data) {
       return let result = data.filter((res)=>{
        return res.created === month;
    })
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This is pure javascript code you can use: -

var monthWithUsercount = {};

for (var i = 0; i < a.length; i++) {
    var num = a[i];
    monthWithUsercount[num.created] = monthWithUsercount[num.created] ? monthWithUsercount[num.created]+1 : 1;
}
//Here "a" is the array consisting months and users.

console.log(monthWithUsercount);

Here is a working fiddle - https://jsfiddle.net/sajalsuraj/7nychnd2/

Hooray!!

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