JSQueryString

HTML

<pre id="results">RESULTS: Waiting...</pre>

JavaScript

var Hogwarts = {
    staff : [
        'Argus Filch',
        'Filius Flitwick',
        'Gilderoy Lockhart',
        'Minerva McGonagall',
        'Poppy Pomfrey'
    ],
    students : [
        'Hannah Abbott',
        'Katie Bell',
        'Susan Bones',
        'Terry Boot',
        'Lavender Brown'
    ]
};

delete Hogwarts.students;

Hogwarts.staff.splice(Hogwarts.staff.indexOf('Minerva McGonnagall') - 1, 1);

$("#results").html(JSON.stringify(Hogwarts, null, 2));