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d3.map = function(object) {
  var map = new d3_Map;
  for (var key in object) map.set(key, object[key]);
  return map;
};

function d3_Map() {}

d3_class(d3_Map, {
  has: function(key) {
    return d3_map_prefix + key in this;
  },
  get: function(key) {
    return this[d3_map_prefix + key];
  },
  set: function(key, value) {
    return this[d3_map_prefix + key] = value;
  },
  remove: function(key) {
    key = d3_map_prefix + key;
    return key in this && delete this[key];
  },
  keys: function() {
    var keys = [];
    this.forEach(function(key) { keys.push(key); });
    return keys;
  },
  values: function() {
    var values = [];
    this.forEach(function(key, value) { values.push(value); });
    return values;
  },
  entries: function() {
    var entries = [];
    this.forEach(function(key, value) { entries.push({key: key, value: value}); });
    return entries;
  },
  forEach: function(f) {
    for (var key in this) {
      if (key.charCodeAt(0) === d3_map_prefixCode) {
        f.call(this, key.substring(1), this[key]);
      }
    }
  }
});

var d3_map_prefix = "\0", // prevent collision with built-ins
    d3_map_prefixCode = d3_map_prefix.charCodeAt(0);
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