d3/src/core/selection-each.js

A small, free JavaScript library for manipulating documents based on data.

d3_selectionPrototype.each = function(callback) {
  for (var j = -1, m = this.length; ++j < m;) {
    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
      var node = group[i];
      if (node) callback.call(node, node.__data__, i, j);
    }
  }
  return this;
};