Javascript sort array using two keys

Question

Hi am working on a chat application, I want to sort new messages plus keeping the history order according to time.

For example, I have the chat messages in an array like this

[{"user":"a", "msg":"Hi ", "msg_count":1, "unix_time":"1474476800000"}
{"user":"b", "msg":"Hi ", "msg_count":1, "unix_time":"1478776800000"}
{"user":"c", "msg":"Hi ", "msg_count":5, "unix_time":"1479276800000"}
{"user":"d", "msg":"Hi ", "msg_count":1, "unix_time":"1478416800000"}
{"user":"e", "msg":"Hi ", "msg_count":3, "unix_time":"1478476800000"}]

How can I also sort them using the "msg_count" key where all greater values should come on the top but the remaining objects should be sorted with the "unix_time" key.

May be you are looking for this stackoverflow.com/questions/6913512/… — Nitheesh
– Nitheesh, Commented Nov 8, 2016 at 10:51
@Cerbrus did you even read my question? i have a number and a string property to sort! All these links don't have none of that! — Ceddy Muhoza
– Ceddy Muhoza, Commented Nov 8, 2016 at 10:59

Pranav C Balan · Accepted Answer · 2016-11-08 11:03:02Z

1

Use Array#sort method with custom compare function.

var data=[{"user":"a", "msg":"Hi ", "msg_count":1, "unix_time":"1474476800000"},
{"user":"b", "msg":"Hi ", "msg_count":1, "unix_time":"1478776800000"},
{"user":"c", "msg":"Hi ", "msg_count":5, "unix_time":"1479276800000"},
{"user":"d", "msg":"Hi ", "msg_count":1, "unix_time":"1478416800000"},
{"user":"e", "msg":"Hi ", "msg_count":3, "unix_time":"1478476800000"}];


data.sort(function(a, b) {
  // return the difference of `msg_count` property to sort based on them
  // if they are equal then sort based on unix_time prop
  return b.msg_count - a.msg_count || 
    b.unix_time - a.unix_time;
})

console.log(data)

edited Nov 8, 2016 at 11:03

answered Nov 8, 2016 at 10:51

Pranav C Balan

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5 Comments

Ceddy Muhoza Over a year ago

Nice one, could you please add sorting for the unix_time key as well

Cerbrus Over a year ago

@Tuna: He already has sorting on unix_time implemented there.

Pranav C Balan Over a year ago

@Tuna : in which order

Ceddy Muhoza Over a year ago

@Pranav i mean the "unix_time" property of each object in the array

Ceddy Muhoza Over a year ago

The Unix_time property is not affected by your function

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