Why wont the array.IndexOf() method work for this

Try using your own index function. Here is a example of mine:

function getIndex(arrayName, search, value) {
    for(var i = 0; i < arrayName.length; i++) {
        if (arrayName[i][value].toLowerCase() === search) return i;
    }
    return -1;
}

To call it you would first put in the name of the array (in this case its students), then you would put your 'search' variabl le, and finally you would put in the property you are trying to match against (in this case name).

getIndex(students, search, "name");

You can check at the MDN documentation about how to use the function and remember almost all the function names start with lowercase "array.indexOf();"

students is an array of objects. The indexOf method searches for the specified item. In this case, the item to look for should be an object. Your code is searching for a string.

Not sure if this is the most efficient solution but I would iterate over each students object and check if the name matches the input from the user.

Hope this helps.