reverse the JSON Array stored in javascript variable

Question

I have a json array stored in variable in format below:

{"info": 
[ {"typeid": "877", "recid": "10", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "877", "recid": "11", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "459", "recid": "3", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "459", "recid": "4", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "456", "recid": "5", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "456", "recid": "6", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"}
]}

I want to reverse the inner JSON array for info.Like this

{"info": 
[ {"typeid": "456", "recid": "6", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "456", "recid": "5", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "459", "recid": "4", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "459", "recid": "3", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "877", "recid": "11", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"},
  {"typeid": "877", "recid": "10", "repeaterid": "0",  "pageid": "26966", "maxrecords": "1"}
]}

How can i achieve this.

enter image description here

Would you like to sort the array or just reverse it?

Eric Herlitz
– Eric Herlitz

2014-02-11 13:13:40 +00:00
Commented Feb 11, 2014 at 13:13 — Eric Herlitz
– Eric Herlitz, Commented Feb 11, 2014 at 13:13

Barmar · Accepted Answer · 2014-02-11 13:26:53Z

21

Use the array reverse method of Javascript:

var objAssetSelection = $.parseJSON(strAssetSelection);
objAssetSelection.info.reverse();
console.log(objAssetSelection);

edited Feb 11, 2014 at 13:26

answered Feb 11, 2014 at 13:13

Barmar

789k57 gold badges554 silver badges669 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

Milind Anantwar Over a year ago

getting undefined for info.

Barmar Over a year ago

Did you replace var with the actual name of your variable that contains the object?

Barmar Over a year ago

Ahh, you haven't parsed the JSON into an object yet.

Milind Anantwar Over a year ago

My bad.....Thanks barmar. That was very helpful. one last question is it possible to reverse the array as well as sort them on the basis of pageid??

Barmar Over a year ago

You can do whatever you want with the array. Javascript has a sort function, ojovirtual's answer shows how to use it.

|

Mihai Matei · Accepted Answer · 2014-02-11 13:14:24Z

6

Did you tried myObject.info.reverse() ?

More about Javascript Array Reverse

answered Feb 11, 2014 at 13:14

Mihai Matei

24.3k5 gold badges34 silver badges50 bronze badges

1 Comment

Milind Anantwar Over a year ago

getting undefined for info.

ojovirtual · Accepted Answer · 2014-02-11 13:14:51Z

2

var sorted=yourobject.info.sort(function(a,b){return a.typeid-b.typeid});

Ref: http://www.w3schools.com/jsref/jsref_sort.asp

answered Feb 11, 2014 at 13:14

ojovirtual

3,36219 silver badges21 bronze badges

Comments

To delete profile · Accepted Answer · 2014-02-11 13:24:21Z

2

and simply (JQuery needed) :

function test() {
    var myArray = [1, 2, 3, 4];
    var myReversedArray = new Array();
    $(myArray).each(function (key) {
        myReversedArray.unshift(myArray[key]);
    });
    myArray = myReversedArray;
    $(myArray).each(function (key) {
        console.log(myArray[key]);
    });
}

answered Feb 11, 2014 at 13:24

To delete profile

3823 silver badges15 bronze badges

1 Comment

To delete profile Over a year ago

Note my solution is not the quickest but I think it's the simpliest. I compared mine to all of those : jsperf.com/js-array-reverse-vs-while-loop/20 Result was : 53,390,542±1.33%85% slower

Ratan Uday Kumar · Accepted Answer · 2017-06-23 07:25:18Z

Successfully Working Converting JSON Array to Reverse JSON Array 101% Working

var ActualArray = [{
        "bag":'large',
        "color":'blue'
    },{
        "bag":'small',
        "color":'red'
    },{
        "bag":'medium',
        "color":'green'
    },{
        "bag":'large',
        "color":'pink'
    }]
    var ReverseArray = [];
    var length = ActualArray.length;
    for(var i = length-1;i>=0;i--){
        ReverseArray.push(ActualArray[i]);
    }
    console.log("actual array");
    console.log(JSON.stringify(ActualArray));
    console.log("reverse array");
    console.log(JSON.stringify(ReverseArray));

Your Log will be like below

actual array
[{"bag":"large","color":"blue"},{"bag":"small","color":"red"},{"bag":"medium","color":"green"},{"bag":"large","color":"pink"}]
reverse array
[{"bag":"large","color":"pink"},{"bag":"medium","color":"green"},{"bag":"small","color":"red"},{"bag":"large","color":"blue"}]

Collectives™ on Stack Overflow

reverse the JSON Array stored in javascript variable

5 Answers 5

7 Comments

1 Comment

Comments

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

7 Comments

1 Comment

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related