Function visit

explainshell/web/static/js/d3.v3.js:5917–5928

(node, previousSibling)

  }
  function d3_layout_treeVisitAfter(node, callback) {
    function visit(node, previousSibling) {
      var children = node.children;
      if (children && (n = children.length)) {
        var child, previousChild = null, i = -1, n;
        while (++i < n) {
          child = children[i];
          visit(child, previousChild);
          previousChild = child;
        }
      }
      callback(node, previousSibling);
    }
    visit(node, null);
  }
  function d3_layout_treeShift(node) {