javascript array object value contains another array value

Question

I have an array like this

"chapters":[
            {
                "_id": "5422c6ba0f6303ba22720e14",
                "chapter_name": "Morbi imperdiet libero sed.",
                "sub_title": "Nam id elit tincidunt amet.",
                 "mystatus": "noidea"   

            },
            {
                "_id": "5422bd0d5cb79ae6205b2f6a",
                "chapter_name": "Donec id accumsan volutpat.",
                "sub_title": "Cras volutpat velit nullam.",
                 "mystatus": "noidea"

            },
            {
                "_id": "5423ea5f17c83ad41da1765e",
                "chapter_name": "Donec id accumsan volutpat.",
                "sub_title": "Cras volutpat velit nullam.",
                 "mystatus": "noidea"

            }

        ],

And I have another one

"currentstat": [
        "5423ea5f17c83ad41da1765e",
        "5422c6ba0f6303ba22720e14",
        "5422bd0d5cb79ae6205b2f6a"
    ],

I want to check any of currentstat array value contains in chapters._id.

And I tried like this.

for (var i = 0; i < chapters.length; i++) {
  var attenId = currentstat.toString();
  if (attenId.indexOf(chapters[i]._id) != -1) {
  }
}

I could not get the result without

var attenId = currentstat.toString();

one more thing I need on this.

I need to assign these status array value to corresponding chapters array as per currentstat array value.

status: [ 'passed', 'passed', 'attending']

the whole code is like this

for (var i = 0; i < chapters.length; i++) {
  var attenId = currentstat.toString();
  if (attenId.indexOf(chapters[i]._id) != -1) {
    allChapters[i].mystatus = (status[i]) ? status[i] : 0;
  }
}

but the value does not assign to corresponding _id Please help!

Samuli Hakoniemi · Accepted Answer · 2014-09-25 11:16:11Z

4

Example:

var currentstat = ["1","2","3"];
var chapters = [{_id:"2"}, {_id:"4"}, {_id:"6"}];

var objects = chapters.filter(function(chapter) {
    return ~currentstat.indexOf(chapter._id);
});

Just replace those arrays with your data and objects will contain the objects that has same id (in this particular example it is [{_id:"2"}].

answered Sep 25, 2014 at 11:16

Samuli Hakoniemi

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Comments

Kevin Reilly · Accepted Answer · 2014-09-25 11:48:57Z

1

The crudest of methods is 2 for loops one inside the other:

for (var i = 0; i < currentstat.length; i++) {
    for (var j = 0; j < chapters.length; j++) {
        if (currentstat[i] === chapters[j]._id){
            alert('found it at: ' + i + ' ' + currentstat[i]);
        }
    }
}

check this fiddle

a bit less crude method would be:

for (var i = 0; i < chapters.length; i++) {
    if (currentstat.indexOf(chapters[i]._id) >= 0) {
        alert('found ' + currentstat[i] + ' at index ' + i);
    }
}

fiddle here.

edited Sep 25, 2014 at 11:48

Kevin Reilly

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answered Sep 25, 2014 at 11:17

avidenic

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3 Comments

Kevin Reilly Over a year ago

Using indexOf would probably be better than iterating on each iteration.

Bergi Over a year ago

However, you would need to apply it on chapters not on currentstat…

Kevin Reilly Over a year ago

Just submitted an edit that does that and makes sure to let falsy index 0 pass evaluation.

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