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[2] is likely best.

Unsynchronized writes, or writes and reads, to the same object by multiple threads is a data race, which causes undefined behavior. You can add locking or atomicity to avoid this, but it will typically be a lot slower. So [1] is unacceptable. Even if the threads access different but nearby elements of the array, you can expect a slowdown due to cache line ping-pong.

But there is no problem with having several threads reading the same object at the same time, as long as nobody is writing. In fact, it is best to have just one copy of the object being read; it saves memory and cache space. Thus [2] is more efficient than [3].

EDIT

If you want to call someFunction on instance stored in lotsOfTestSubject you need to pass pointer to className object on which this method will be called, so the line below

In your setter, you have this line:

Instead of using Random rng = new Random(); inside the for loop, create a single instance above, and use the same instance in each loop. This is because multiple Random instances created in quick succession will have the same seed and therefore generate the same sequence of pseudorandom numbers.

For example:

I think you will find that TWO problems occur trying to control DHTML javascript outside the problems of a DTD type for the (X)HTML page.

1. You need to place the CSS attribute-name and value "visibility:visible;" or "visibility:hidden;" into each CSS style class or "#" layer notation or DIV tag of its style= attribute as appropriate default value.
2. To manipulate the visibility attribute by DHTML it should first be instantiated in the CSS document declaration of classes and layer notations or it may fail the first attempt by the user or outright fail altogether. CSS DHTML is generally not able to be manipulated if the attribute has not been declared first, too depending the browser depends the default value to use upon the div!

Usual default value is "visible" !

You should use join instead of stringify

First and foremost:

• Do not create a double for bank_account.
• Do not mock/stub bank_account.create_bank_account.

If you do either of these things, in a test that is supposed to be testing behaviour of BankAccount#create_bank_account, then your test is worthless.

(To prove this point, try writing broken code in the method. Your tests should obviously fail. But if you're mocking the method, everything will remain passing!!)

One way or another, you should only be mocking the stripe request, i.e. the behaviour at the boundary between your application and the internet.

I cannot provide a working code sample without a little more information, but broadly speaking you could refactor your code from this:

After a bit of experimentation I could reproduce your error. In the case it was enough to jit the function passed to your secant_method_curried: