remove all children

fixes #275

Author: Fil

src/selection/selectChildren.js

@@ -3,7 +3,7 @@ import {childMatcher} from "../matcher.js";
 var filter = Array.prototype.filter;
 
 function children() {
-  return this.children;
+  return Array.from(this.children);
 }
 
 function childrenFilter(match) {

test/selection/remove-test.js

@@ -29,3 +29,13 @@ it("selection.remove() skips missing elements", "<h1 id='one'></h1><h1 id='two'>
   assert.strictEqual(one.parentNode, null);
   assert.strictEqual(two.parentNode, document.body);
 });
+
+tape("selectChildren().remove() removes all children", function(test) {
+  var document = jsdom("<div><span>0</span><span>1</span><span>2</span><span>3</span><span>4</span><span>5</span><span>6</span><span>7</span><span>8</span><span>9</span></div>"),
+      p = document.querySelector("div"),
+      selection = d3.select(p).selectChildren();
+  test.equal(selection.size(), 10);
+  test.equal(selection.remove(), selection);
+  test.equal(d3.select(p).selectChildren().size(), 0);
+  test.end();
+});