> E.g. when I see something like _(array).filter(...).map(...).reject(...).reduce() I like to think of taking a value and following it the way you would across

> E.g. when I see something like _(array).filter(...).map(...).reject(...).reduce() I like to think of taking a value and following it the way you would across a spreadsheet and think of filter, map and reject as "columns". This is the practical use of functional Javascript methods after they are written, though. Following the code in the filter/map/reject/etc functions themselves is a bit more difficult.