Because Flat is a global object, thus storing unnecessary results from previous function calls.

I don't follow, how does the end parentheses make it private?

I too not recommended using eval.. I think this kata trying learn us work on state machine.

I know, just saying is not best practice to use it. Have a great day and happy coding :)

Using eval would not be recommended if you can't control the input (For example 'user input' -> could be executed as code)
This is a Kata though, not a function that would run after some user input on an actual application.

nice solution, although using eval is not recommended for security reasons.

"for" loops are the fastest. Any other function does that internally anyway.

I managed to do it in the end ! very nice kata. I learnt a lot ! Well done guys !

How can size property be not enumerable, writable nor configurable ?
I was able to change the value of property size when writable = false && configurable = true OR writable = true && configurable = false.
If they are all false there is no way to change the value of the property size. Am I missing something? Any suggestion?
Thank you !

same problem here, I dont know what to do. anyone can help us? haha

Hey, I was wondering if it is possible to use jQuery methods.
I'm cloning my objects using "jQuery.extend(true, {}, vectorToClone);"
but it is not allowing me.

This is the best solution for me. Well done ^^