Tips for eliminating Blank Attributes from a multi-level JavaScript Object

Question

Tips for eliminating Blank Attributes from a multi-level JavaScript Object

Here is a JavaScript object example:

var test = {"code_operateur":[""],"cp_cult":["",""],"annee":["2011"],"ca_cult":[""]}

After running a function on it:

for (i in test) {  
   if ( test[i] == "" || test[i] === null ) {  
       delete test[i];  
    }  
}

The resulting object is:

{"cp_cult":["",""],"annee":["2011"]}

Although it's close, I actually want to remove the empty "cp_cult" property, which is an array instead of a string like the others.

Important: I am looking for a solution that does not involve manually deleting the key!

javascript object

Answer 1

Answer №1

It seems like you have two questions to address.

How can I delete a property from an object?
How do I determine if an object is actually an array?

To remove a property from an object, you can use the delete operator.

delete example.object_property;

In JavaScript, arrays are classified as objects, causing the typeof([]) to mistakenly return object. To address this, many developers rely on frameworks like dojo.isArray or custom methods to accurately identify arrays.

Identifying an object as an array doesn't have a foolproof solution. Typically, developers check for array-like methods and properties such as length, push, pop, shift, unshift, among others.

Answer 2

It seems like you have two questions to address.

How can I delete a property from an object?
How do I determine if an object is actually an array?

To remove a property from an object, you can use the delete operator.

delete example.object_property;

In JavaScript, arrays are classified as objects, causing the typeof([]) to mistakenly return object. To address this, many developers rely on frameworks like dojo.isArray or custom methods to accurately identify arrays.

Identifying an object as an array doesn't have a foolproof solution. Typically, developers check for array-like methods and properties such as length, push, pop, shift, unshift, among others.

Answer 3

Answer №2

Give this a shot:

function checkEmpty(obj) {
 for(var key in obj){
  if(obj[key]) {
   return false;
  }
 }
 return true;
}

for(index in data) {
 if ( data[index] == "" || data[index] === null || (typeof data[index] == "object" && checkEmpty(data[index])) ) {
  delete data[index];
 }
}

Of course, for more complex objects, you may need more sophisticated algorithms. If the array can contain nested arrays with empty strings that should also be deleted, additional checks will be required.

UPDATE: I've created something that might suit your requirements, feel free to take a look at: http://jsfiddle.net/jVHNe/

Answer 4

Give this a shot:

function checkEmpty(obj) {
 for(var key in obj){
  if(obj[key]) {
   return false;
  }
 }
 return true;
}

for(index in data) {
 if ( data[index] == "" || data[index] === null || (typeof data[index] == "object" && checkEmpty(data[index])) ) {
  delete data[index];
 }
}

Of course, for more complex objects, you may need more sophisticated algorithms. If the array can contain nested arrays with empty strings that should also be deleted, additional checks will be required.

UPDATE: I've created something that might suit your requirements, feel free to take a look at: http://jsfiddle.net/jVHNe/

Tips for eliminating Blank Attributes from a multi-level JavaScript Object

Answer №1

Answer №2

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