I've been trying to properly understand how @,@:,&, and &: work, but I'm
struggling a bit it would seem.
My understanding of @ is that with more than one use in its dyadic form, you
get this behaviour:
x f@g@h y === f g x h y
And I understand the difference between the colon and non-colon versions of
both.
What is confusing me most is the interplay between them in longer trains of
verbs. For example, why don't these expressions work?
{.@2&x:@(+%)/ 1 2
|domain error
| {.@2&x:@(+%)/1 2
{.&2&x:@(+%)/ 1 2
|domain error
| {.&2&x:@(+%)/1 2
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