Function d3_selection_enter

explainshell/web/static/js/d3.v3.js:1045–1048

(selection)

    return null;
  };
  function d3_selection_enter(selection) {
    d3_arraySubclass(selection, d3_selection_enterPrototype);
    return selection;
  }
  var d3_selection_enterPrototype = [];
  d3.selection.enter = d3_selection_enter;
  d3.selection.enter.prototype = d3_selection_enterPrototype;