Random Sort/Shuffle a List

Random Sort/Shuffle a List

I'm trying to figure out an efficient method to randomly shuffle a list. Basically an implementation of Fisher/Yates/Knuth algorithm. In order to do this efficiently the best way is to repeatedly swap two elements in a list (or even a map). The built in functions do not seem to allow you directly write to elements in lists. So I end up having to repeatedly create temporary lists. Which is obviously very inefficient and slow. 

Can anyone think of a better way to easily swap two elements within the same list.

Any tips or advice much appreciated.

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