Edit in JSFiddle

//Unique array fonksiyonu
Array.prototype.unique = function() {
    var unique = [];
    for (var i = 0; i < this.length; i++) {
        for (var j = i + 1; j < this.length; j++) {
            if (this[i] === this[j]) j = ++i;
        }
        unique.push(this[i]);
    }
    return unique;
};


//Implementasyon fonksiyonu
Function.prototype.implements = function(interfaces) {
    var _implements = [];
    for (var i = 0; i < arguments.length; i++) {
        _implements = _implements.concat(arguments[i]);
    }
    _implements = _implements.unique();
    console.log(this.prototype);
    for (var i = 0; i < _implements.length; i++) {
        if (!(_implements[i] in this) && !(_implements[i] in this.prototype)) {
            throw new Error('Implementation failed, ' + _implements[i] + ' should be implemented');
        }
    }
}

var iAnimal = ['speak', 'walk'];

function Animal() {}
Animal.implements(iAnimal, ['a']);