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Why do we use sel[x] here in u.q, could we not have just used x?
sel:{$[`~y;x;select from x where sym in y]} / from u.qMy understanding is that sel returns x unless you enter a y?
If this is the case, could we not have used “x” instead of “sel[x]” in pub?
pub:{[t;x]{[t;x;w]if[count x:sel[x]w 1;(neg first w)(`upd;t;x)]}[t;x]each w t}
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1 Reply
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Hi,
The sel[x]w 1 , call is the same as sel[x;w 1]. So, y =w 1, which will be a list of symbols or ` if no filtering on syms is to be applied.
Then within sel function, filtering is applied if y is not equal to ` with the select from x where sym in y.Omitting sel from the pub function would remove this functionality to subscribe to a subset of syms.
Let me know if this helps or not.
Patrick
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