flow like the river

VISUALIZACION/node_modules/d3-transition/src/transition/select.js

@@ -0,0 +1,22 @@
+import {selector} from "d3-selection";
+import {Transition} from "./index.js";
+import schedule, {get} from "./schedule.js";
+
+export default function(select) {
+  var name = this._name,
+      id = this._id;
+
+  if (typeof select !== "function") select = selector(select);
+
+  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
+      if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
+        if ("__data__" in node) subnode.__data__ = node.__data__;
+        subgroup[i] = subnode;
+        schedule(subgroup[i], name, id, i, subgroup, get(node, id));
+      }
+    }
+  }
+
+  return new Transition(subgroups, this._parents, name, id);
+}