Removing unwanted keys from my array of objects

Question

My Object

How to remove keys like UserID, UserName from it... i mean selected keys... delete operator is not working in my case.

for (i=0 i <obj.length; i ++) {
    delete obj[i]['keyName']; 
}

The above does not work, neither throws an error. Any other way...

delete should work. Show the full code

Raynos
– Raynos

2011-07-21 12:32:51 +00:00
Commented Jul 21, 2011 at 12:32 — Raynos
– Raynos, Commented Jul 21, 2011 at 12:32
You're probably using for loop the wrong way.

duri
– duri

2011-07-21 12:34:02 +00:00
Commented Jul 21, 2011 at 12:34 — duri
– duri, Commented Jul 21, 2011 at 12:34

Quentin · Accepted Answer · 2011-07-21 12:39:52Z

6

You missed the ; after i=0.

Additionally, obj needs to be MyObject.PatientVitalsGetResult.Vitals

edited Jul 21, 2011 at 12:39

answered Jul 21, 2011 at 12:33

Quentin

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1 Comment

Molecular Man Over a year ago

MyObject.PatientVitalsGetResult.Vitals actualy

wanovak · Accepted Answer · 2011-07-21 12:34:43Z

1

Don't use delete; it will set the element to undefined instead of removing it. Instead, use splice.

var i;
for(i = 0; i < obj.length; i++){
    obj[i].splice('keyName',1);
}

answered Jul 21, 2011 at 12:34

wanovak

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1 Comment

Quentin Over a year ago

I'm pretty sure that the goal is to remove a named key from each object in an array, not individual array elements.

FK82 · Accepted Answer · 2011-07-21 12:50:37Z

1

There is no standard way for this, afaik. You will need to perform a conditional copy of the old Object filtering the unwanted properties:

var oldObject = { /* your object */ } ;
var newObject = { } ;

var filter = { "UserID": true , "UserName": true } ;

for(var key in oldObject) 
    if( !(key in filter) ) newObject[key] = oldObject[key] ;

Then use the acquired newObject in the following code.

answered Jul 21, 2011 at 12:50

FK82

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1 Comment

FK82 Over a year ago

I don't understand your criticism. How is this approach "costly"? How is it "not needed" (especially if there is no other way to remove entries from an Object).

Anatoly · Accepted Answer · 2011-07-21 12:55:57Z

1

var vitals = obj["PatientVitalsGetResult"]["Vitals"];


for (i=0; i < vitals.length; i++) {
    delete(vitals[i]["UserID"])
};

answered Jul 21, 2011 at 12:55

Anatoly

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Comments

Thalaivar · Accepted Answer · 2011-07-21 13:55:12Z

0

How about this solution....

Array.prototype.containsValue = function (value) {
        for (var k in this) {
            if (!this.hasOwnProperty(k)) {
                continue;
            } //skip inherited properties
            if (this[k] == value) {
                return true;
            }
        }
        return false;
    };

for (var key in Object) {
    var unwantedKeys = ['UserName', 'UserID'];
    if (unwantedKeys.containsValue(key)) continue;
    // Play with your Object it won't contain these unwanted keys.
}

Delete should work, i am not sure about the mistake you are doing..

http://jsfiddle.net/spechackers/43hTD/

answered Jul 21, 2011 at 13:55

Thalaivar

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3 Comments

Andy E Over a year ago

@John: as a reminder, it's generally bad practice to use a for...in loop on arrays. Order of iteration is not guaranteed and any non-index enumerable properties will also be iterated over. Just something to think about if you're implementing this solution.

Thalaivar Over a year ago

@Andy E: Are you talking about the fiddle or my other response... i was just showing the OP that delete works...

Andy E Over a year ago

@Vinothbabu: I'm talking about the Array.prototype.containsValue function here, which uses a for...in loop to iterate over this. this would be an array, so for...in isn't really appropriate to use.

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