adopt InternMap

mbostock · mbostock · commit 4bb7275c2222 · 2021-03-02T19:00:18.000-08:00
diff --git a/src/transforms/stack.js b/src/transforms/stack.js
@@ -218,16 +218,14 @@ function maybeRank(rank, data, I, X, Y, Z) {
   }
 
   // a generic function
-  if (typeof rank === "function") {
-    return valueof(data, rank);
-  }
+  if (typeof rank === "function") return valueof(data, rank);
 
   // an array or iterable of z (particularly useful with groupSort)
   return positions(Z, rank);
 }
 
 // returns the positions of each element of A in B
 function positions(A, B) {
-  B = new Map(Array.from(B, (d, i) => [d, i]));
+  B = new InternMap(Array.from(B, (d, i) => [d, i]));
   return A.map(d => B.get(d));
 }

Original file line number	Diff line number	Diff line change
`@@ -218,16 +218,14 @@ function maybeRank(rank, data, I, X, Y, Z) {`
`218`	`218`	`}`
`219`	`219`
`220`	`220`	`// a generic function`
`221`		`- if (typeof rank === "function") {`
`222`		`- return valueof(data, rank);`
`223`		`- }`
	`221`	`+ if (typeof rank === "function") return valueof(data, rank);`
`224`	`222`
`225`	`223`	`// an array or iterable of z (particularly useful with groupSort)`
`226`	`224`	`return positions(Z, rank);`
`227`	`225`	`}`
`228`	`226`
`229`	`227`	`// returns the positions of each element of A in B`
`230`	`228`	`function positions(A, B) {`
`231`		`- B = new Map(Array.from(B, (d, i) => [d, i]));`
	`229`	`+ B = new InternMap(Array.from(B, (d, i) => [d, i]));`
`232`	`230`	`return A.map(d => B.get(d));`
`233`	`231`	`}`