d3-jsnext/src/arrays/set.js

d3, but futuristic

import { d3_map_unescape, d3_map_empty, d3_map_size, d3_map_keys, d3_map_remove, d3_map_escape, d3_map_has } from './map';
import { d3_class } from '../core/class';

var d3$set;

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() {
  this._ = Object.create(null);
}

d3_class(d3_Set, {
  has: d3_map_has,
  add: function(key) {
    this._[d3_map_escape(key += "")] = true;
    return key;
  },
  remove: d3_map_remove,
  values: d3_map_keys,
  size: d3_map_size,
  empty: d3_map_empty,
  forEach: function(f) {
    for (var key in this._) f.call(this, d3_map_unescape(key));
  }
});

export { d3$set, d3_Set };