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{. and {: Extended |
initial writing: 2001-10-22 |
The monads {. and {: are now defined as follows:
{.y ↔ 0{ 1{.y
{:y ↔ 0{_1{.y
Therefore, {.y gives the first
item of y , or
an item of fills if y has no items;
likewise {:y gives the last item,
or fills if y has no items.
{.!.f and {:!.f specify that the fill should be
the atom f .
Previously, {.y and {:y
signalled an index error if y had no items.