Am 07.03.2019 um 12:55 schrieb Michael Kay mike(_at_)saxonica(_dot_)com:
A good simple use case for fold-left() is to accumulate a running total, i.e.
turn (1,2,3,4) into (1,3,6,10).
The example to simply compute the running total (e.g. map (1,2,3,4) to
10) is in the spec with
fold-left((1 to 4), 0, function($a, $b) { $a + $b})
But to map the whole sequence (1,2,3,4) with fold-left to a new sequence
of (1,3,6,10) I am already struggling to express that in a compact way, is
fold-left(
(1 to 4),
(),
function ($a, $b) { $a, if (empty($a)) then $b else $b + $a[last()] }
)
a good way? Or can the third argument, the function be expressed in a
more compact way?
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