1

To construct an object like this:

params (Object) (defaults to: {}) —
    Delete — required — (map)
        Objects — required — (Array<map>)
            Key — required — (String) Key name of the object to delete.

I'm doing this:

var params = {
    Bucket : data.bucket,
    Delete: [{
    Objects:[{ Key:""}] }]  
};

for(i=0;i<data.keys.length;i++){
    params.Delete[0].Objects[i].Key = data.keys[i];
}

It breaks on the Key with

params.Delete[0].Objects[i].Key = data.keys[i];
                                ^

TypeError: Cannot set property 'Key' of undefined

What am I doing wrong?

It turns out there is only one Key inside of Objects. I'd like to put as many keys as I want inside of Objects so as to properly construct the object. How can I do this?

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2
  • 1
    because Objects[1] is undefined... Commented Jan 2, 2014 at 17:40
  • Even if the rightside value of assignment is wrong, you would get the same error. Javascript fails the complete line and complains about leftside value. I thought the statement must be params.Delete[0].Objects[i].Key = data[i];. Because you are looping through data.keys.length which was not known to us, We can not judge the number of looping iterations. Commented Jan 2, 2014 at 18:10

2 Answers 2

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1

How many object literals are in the Objects array? From your initialization it only looks like 1. But you are using a for loop, implying you expect more than one.

That error means Objects[i] is undefined for whatever value of i you reach when it occurs.

It seems like you need to do something like

 for(i=0;i<data.keys.length;i++){
    params.Delete[0].Objects.push({Key: data.keys[i]})
 }

to get new object literals into your Objects array as you process your data (change your definition of params to just have an empty array for Objects initially).

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3 Comments

I want there to be as many Keys as there are in data.keys. I thought that the array of Objects would be dynamic
"How many object literals with a Key property are in the Objects array?" Or indeed, without a Key property...
@Houseman: It is, but when i is 1, Objects[i] is undefined. You're trying to treat it like an object. You probably meant .Objects[i] = { Key: data.keys[i] };
0

Your params.Delete[0].Objects here has only one object in it and it happens when the i is 1. you are counting a for loop based on the other loop with 2 different length.

data.keys

is different from:

params.Delete[0].Objects

this one has only one object, whereas the first one has more than one object.

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