[javascript] How to get an array of unique values from an array containing duplicates in JavaScript?

Here is an Array Prototype function:

Array.prototype.unique = function() {
    var unique = [];
    for (var i = 0; i < this.length; i++) {
        if (unique.indexOf(this[i]) == -1) {
            unique.push(this[i]);
        }
    }
    return unique;
};

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