why not a,b or x,y?
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I like range-based for loops. You can just name the iterator after the object that it actually is. Have to be a little careful though, if the container is named a plural noun, and the natural name is the same word minus the easy-to-miss 's'.
a plural noun
sheep.each do |sheep| sheep.baaah end
Oh shit :D
This is one of the few things I really like about JS/TS. for (thing of things) is very legible and self documenting.