Usage of empty array allocation for custom class

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Say, we have a class Car

classdef Car < handle
    properties
        wheels = 4;
    end
    methods
        function obj = Car()
        end
    end
end

We can create ten cars like so

cars = Car.empty();

for ii = 1:10
    cars(end+1) = Car;
end

However, one can make an empty array of cars first

>> cars = Car.empty(0,10)

cars = 

  0x10 Car array with properties:

    wheels

What I do not understand: If one now puts a single car in it, the array seems to shrink to a single element

>> cars(1) = Car

cars = 

  Car with properties:

    wheels: 4

So, does allocating such an empty array make any sense?

asked 40 secs ago

embert

2,243

Usage of empty array allocation for custom class