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How can I remove an object inside another object, if I don't know it's depth?

Json Object

{
  "foo": {
     "1" : {
        "bar" : "a",
        "foo" : {
          "2" : "aa"
        }
      },
     "3" : {
        "bar" : "b",
        "foo" : {
          "4" : "bb"
        }
      }
   }
}

Let say I want to remove "4", but "4" could have been a first level child or be inside another child?

How can I remove an object inside another object, if I don't know it's depth?

Json Object

{
  "foo": {
     "1" : {
        "bar" : "a",
        "foo" : {
          "2" : "aa"
        }
      },
     "3" : {
        "bar" : "b",
        "foo" : {
          "4" : "bb"
        }
      }
   }
}

Let say I want to remove "4", but "4" could have been a first level child or be inside another child?

• javascript
• jquery
• json
• object

Share Improve this question Follow asked Aug 23, 2013 at 19:45 Simon ArnoldSimon Arnold 16.2k88 gold badges6868 silver badges8888 bronze badges 12

• 2 To be clear, is this a json string, or a javascript object? – Jason P Commented Aug 23, 2013 at 19:46
• 2 what should be done if there are multiple 4's (or none at all)? – John Dvorak Commented Aug 23, 2013 at 19:46
• anyways, I remend changing the data structure – John Dvorak Commented Aug 23, 2013 at 19:47
• @Jan Dvorak What would you suggest? – Simon Arnold Commented Aug 23, 2013 at 19:48
• 2 recursively iterate over the structure till you find an object that has a "4" key, and remove it. – Kevin B Commented Aug 23, 2013 at 19:50

 |  Show 7 more ments

2 Answers 2

Sorted by: Reset to default 7

Here is another recursive solution, the difference between my version and adeneo's is that mine will stop as soon as a matching key is found. This is more efficient if you know there won't be multiple occurrences of the same key, or you are okay with only removing one of each occurrence per call:

function remove(obj, key) {
    for (var k in obj) {
        if (k == key) {
            delete obj[key];
            return true;
        } else if (typeof obj[k] === "object") {
            if (remove(obj[k], key)) return true;
        }
    }
    return false;
}

iteration is the key:

function remove(obj, key) {
    for (k in obj) {
        if (k==key) {
            delete obj[k];
        }else if (typeof obj[k] === 'object') {
            remove(obj[k], key);
        }
    }
}

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