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var p = [35, 2, 65, 7, 8, 9, 12, 121, 33, 99];

Array.prototype.max = function() {
    return Math.max.apply(null, this);
};

Array.prototype.min = function() {
    return Math.min.apply(null, this);
};
console.log("Max value is: " + p.max() + "\nMin value is: " + p.min()); 
// Max value is: 121
// Min value is: 2