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I took it more like the way you specify certain jQuery operations such as:

    $('.card').hide();
to mean "hide all cards", or

    $('.card.green').show();
to mean "show all green cards". It's really comfortable to think about operating on the set like this and not having to worry about looping on the individual items.



In fact thinking of it as a set frees computing to do things concurrently invisibly.

A lot of other comments here say "ah, but that's just JS iteration still"... but there's really nothing to prevent it being the equivalent of a Go routine... no order implied, no iteration implied, but all the things in the set will have the functions hide() or show() called.




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