optimize the case of empty bins

Fil · Fil · commit 1f46c3fe90d3 · 2021-08-09T19:29:27.000+02:00
diff --git a/src/transforms/bin.js b/src/transforms/bin.js
@@ -228,7 +228,7 @@ function bincumset([bin], j, bins) {
 }
 
 function binfilter([{x0, x1}, set]) {
-  return [x0, x1, I => I.filter(set.has, set)]; // TODO optimize
+  return [x0, x1, set.size ? I => I.filter(set.has, set) : () => []]; // TODO optimize
 }
 
 function maybeInset(inset, inset1, inset2) {

Original file line number	Diff line number	Diff line change
`@@ -228,7 +228,7 @@ function bincumset([bin], j, bins) {`
`228`	`228`	`}`
`229`	`229`
`230`	`230`	`function binfilter([{x0, x1}, set]) {`
`231`		`- return [x0, x1, I => I.filter(set.has, set)]; // TODO optimize`
	`231`	`+ return [x0, x1, set.size ? I => I.filter(set.has, set) : () => []]; // TODO optimize`
`232`	`232`	`}`
`233`	`233`
`234`	`234`	`function maybeInset(inset, inset1, inset2) {`