Design Parking System LeetCode solution in JavaScript

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var ParkingSystem = function (big, medium, small) {
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  this.count = [big, medium, small];
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};
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/**
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 * @param {number} carType
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 * @return {boolean}
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 */
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ParkingSystem.prototype.addCar = function (carType) {
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  return this.count[carType - 1]-- > 0;
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};
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/**
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 * Your ParkingSystem object will be instantiated and called as such:
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 * var obj = new ParkingSystem(big, medium, small)
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 * var param_1 = obj.addCar(carType)
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 */