在javascript中搜索命名数组

Question

This might be a duplicate but I could not help but post this, I have an array with this format

answerCollection= {
0:
{selected : a,
 status :  false   
 },
1:
{selected : a,
 status :  false   
 }
}

I want to do an index check on the this aray like this

if(answerCollection.indexOf(indexNo) == -1){
 sel = "a";
 }

but it keeps failing ie I keep getting a return value of -1, irrespectively of if the index exist in the array or not.

How do I do this kind of search?

Answer 1

if(indexNo in answerCollection){
 sel = "a";
 }

Best practice to detect properties in an object. In your case, maybe you need to convert to string

if(indexNo.toString() in answerCollection){
     sel = "a";
     }

Answer 2

if(answerCollection[indexNo] == null){
 sel = "a";
}

for example look here .