In JavaScript, why is the array object only showing the last data for each index?

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Without seeing your specific code, it's hard to say for sure. However, a common mistake that can cause this behavior is overwriting the previous values in the array instead of adding to them. For example, if you have a loop that sets a value at index i of the array like this:

myArray[i] = someValue;

If you have this line of code inside a loop that iterates over i, and someValue changes every time through the loop, then this line of code will keep replacing any previous value at index i with the new value. Therefore, when the loop finishes, you will only see the last value that was set for each index.

To avoid this problem, make sure you're properly adding to the array instead of overwriting previous values. For example, you could use the push method to add new values to the end of the array:

myArray.push(someValue);

This way, each new value will be added to the end of the array, rather than overwriting any previous value at a specific index.