src/arrays/set.js

import "../core/class";
import "map";

d3.set = function(array) {
  var set = new d3_Set;
  if (array) for (var i = 0, n = array.length; i < n; ++i) set.add(array[i]);
  return set;
};

function d3_Set() {}

d3_class(d3_Set, {
  has: d3_map_has,
  add: function(value) {
    this[d3_map_prefix + value] = true;
    return value;
  },
  remove: function(value) {
    value = d3_map_prefix + value;
    return value in this && delete this[value];
  },
  values: d3_map_keys,
  size: d3_map_size,
  empty: d3_map_empty,
  forEach: function(f) {
    for (var value in this) if (value.charCodeAt(0) === d3_map_prefixCode) f.call(this, value.substring(1));
  }
});