Basically, he wants some class that acts as an array. That works just fine.

I'd make one reccomendation - be positive that addItem() is always going to do an unshift. It's more intuitive to add to the end vs. the beginning of a list.

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We are the carpenters and bricklayers of the Information Age.

Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.