On Tuesday, 1 November 2016 at 22:09:50 UTC, e-y-e wrote: > On Tuesday, 1 November 2016 at 22:06:36 UTC, Ivan Kazmenko > wrote: >> ... > > damn, that was a typo [cumulativeFold -> cumulativeSum] similarly, in the first para, cumulativeSum!((a, b) => a + b)(r, s) -> cumulativeFold!((a, b) => a + b)(r, s)