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2

I have JSON Object that looks something like the below object, this object can go on for days. So I am wondering is there anyway I can delete full set a set being the equivalent of locations[0] or locations[1] in the example below. I'd have to first iterate over the Object and try to figure out which one is which though. So lets say I am looking to remove an set where the zipcode is 06238, I would need to run over the entire locations object and find out which set it is in the object, then remove it accordingly. Question is I'm not sure how to approach that notion.

{
"locations": [
            {
                "city": "San Jose",
                "state": "CA",
                "zipcode": "95125",
                "longitude": "0",
                "latitude": "0"
            },
            {
                "city": "Coventry",
                "state": "CT",
                "zipcode": "06238",
                "longitude": "0",
                "latitude": "0"
            }
        ]
    }
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2 Answers

up vote 5 down vote accepted

try this out

delete locations[0];

You go through a normal JSON iteration like this

jQuery.each(locations, function(i, val) {
   if(val.zipcode == "yourvalue") // delete index
   {
delete locations[i];
  }
});

something like that. are you looking for an idea or a complete function.

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here is jsfiddle example jsfiddle.net/ChpFu – Jaspreet Chahal Feb 8 '12 at 3:23
1  
I'd be cautious about removing elements from an array while iterating through it, especially if using a method like jQuery.each() that caches the .length before it starts... – nnnnnn Feb 8 '12 at 3:30
   
A complete solution is always nice, won't ever deny one of those :-D however something as a foot hold always work to. This I think works for me well. Ill be testing this out shortly enough, thanks – chris Feb 8 '12 at 3:31
if a match is found I would likely remove it after the loop, catching which specific object set it was in the above mentioned concept as a variable to pass to something like delete if found. Its a good foot hold for me to run with, and thats all I could have asked for. – chris Feb 8 '12 at 3:33
up vote 2 down vote

You could write a removeFirst function like this:

function removeFirst(arr, func)
    {
        for (var i=0; i<arr.length; i++)
        {
            if (func.call(arr[i]))
            {
                arr.splice(i,1);
                return arr;
            }
        }
    }

and then call it: 

removeFirst(locations, function(){return this.zipcode=="06238";});

If you want to remove more then one element, you could write it like this:

function removeMany(arr, func)
    {
        for (var i=arr.length; i>0; --i)
        {
            if (func.call(arr[i]))
            {
                arr.splice(i,1);
            }
        }
        return arr;
    }

and use it in the same way.

Alternatively, use underscore (http://documentcloud.github.com/underscore) reject method in a similar way:

_.reject(locations, function(location){ return location.zipcode=="06238";});

Underscore is pretty good for doing array manipulations.

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For loop in Removemany() should be for (var i=arr.length; i>0; --i). – Saneesh CS Oct 3 '12 at 21:59

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