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I have the following Object and I want to check if Type.ID contains value 6508 :

 {
   "item": {
      "Feature": [
         {
            "ID": 85408,
            "Status": {
                "ID": 65,
             },
             "Type": {
                 "ID": 6508,
                  "Volume": null
              },
              "Manufacturer": null
          },
          {
             "ID": 85409,
             "Status": {
                 "ID": 65,
              },
              "Type": {
                  "ID": 6509,
                   "Volume": null
              },
              "Manufacturer": null
          }
       ],
       "Errors": {
           "Result": 0,
           "Message": ""
        },
       "RecordCount": 2
      }
 }

I can muster the following:

for (i = 0; i < data.item.Feature.length; i++) {
     if (data.item.Feature[i].Type.ID == 6508)
        return true;
}
return false;

How can I use underscore.js to do the same? The following doesn't work?

_.contains(data.item.Feature.Type.ID, 6508)

I have the following Object and I want to check if Type.ID contains value 6508 :

 {
   "item": {
      "Feature": [
         {
            "ID": 85408,
            "Status": {
                "ID": 65,
             },
             "Type": {
                 "ID": 6508,
                  "Volume": null
              },
              "Manufacturer": null
          },
          {
             "ID": 85409,
             "Status": {
                 "ID": 65,
              },
              "Type": {
                  "ID": 6509,
                   "Volume": null
              },
              "Manufacturer": null
          }
       ],
       "Errors": {
           "Result": 0,
           "Message": ""
        },
       "RecordCount": 2
      }
 }

I can muster the following:

for (i = 0; i < data.item.Feature.length; i++) {
     if (data.item.Feature[i].Type.ID == 6508)
        return true;
}
return false;

How can I use underscore.js to do the same? The following doesn't work?

_.contains(data.item.Feature.Type.ID, 6508)

• javascript
• jquery
• underscore.js

Share Improve this question Follow asked Apr 2, 2017 at 7:22 adam78adam78 10.1k2424 gold badges107107 silver badges221221 bronze badges

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3 Answers 3

Sorted by: Reset to default 5

You don't need underscore for this; example in plain JS.

data.item.Feature.some(function(x) { return x.Type.ID === 6508 });

Using @FakeRainBrigand JS code I've manged to achieve the same using underscore by doing the following:

_.some(data.item.Feature, function(f) {
       return f.Type.ID == 6508;
 })

Just a suggestion bro, if in case you want whole object (Inside 'Feature' List) not just the Boolean according to your search criteria, you can go this way as mentioned below.

var val = _.findWhere(data.item.Feature, {'Type': _.findWhere(_.pluck(data.item.Feature, 'Type'), {ID: 6509})});

This will return:

{
 "ID":85409,
 "Status":{
 "ID":65
},
 "Type":{
    "ID":6509,
    "Volume":null
    },
 "Manufacturer":null
}

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