Append object and property in JavaScript

Question

In JavaScript, how can I push an object to an array, along with some other new property. For example, I want to do something like this:

for(var i=0; i<T_ARRAY.length; i++)
{
   if(!T_ARRAY[i].isCorrect)
   {
      NEW_ARRAY.push({T_ARRAY[i], 'idxPerg' : i+1});
   }    
}

possible duplicate of Dynamic variable in javascript push function — Denys Séguret
– Denys Séguret, Commented Mar 27, 2013 at 17:47

Agustin Meriles · Accepted Answer · 2013-03-27 17:44:59Z

1

You could simply add the property by doing something like this:

for(var i=0; i<T_ARRAY.length; i++)
{
   if(!T_ARRAY[i].isCorrect)
   {
       var newObj = T_ARRAY[i];
       newObj.idxPerg = i+1;
       NEW_ARRAY.push(newObj);
   }    
}

Also you can use the dynamic key notation

for(var i=0; i<T_ARRAY.length; i++)
{
   if(!T_ARRAY[i].isCorrect)
   {
       var newObj = T_ARRAY[i];
       newObj["idxPerg"] = i+1;
       NEW_ARRAY.push(newObj);
   }    
}

answered Mar 27, 2013 at 17:44

Agustin Meriles

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Comments

Quentin · Accepted Answer · 2013-03-27 17:45:23Z

1

JavaScript does not have any syntax which adds a property to an object and returns the original object. You have to do it in two statements.

T_ARRAY[i].idxPerg = i+1;
NEW_ARRAY.push(T_ARRAY[i]);

answered Mar 27, 2013 at 17:45

Quentin

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