src/arrays/map.js

import "../core/class";

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

function d3_Map() {}

d3_class(d3_Map, {
  has: d3_map_has,
  get: function(key) {
    return this[d3_map_prefix + key];
  },
  set: function(key, value) {
    return this[d3_map_prefix + key] = value;
  },
  remove: d3_map_remove,
  keys: d3_map_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;
  },
  size: d3_map_size,
  empty: d3_map_empty,
  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);

function d3_map_has(key) {
  return d3_map_prefix + key in this;
}

function d3_map_remove(key) {
  key = d3_map_prefix + key;
  return key in this && delete this[key];
}

function d3_map_keys() {
  var keys = [];
  this.forEach(function(key) { keys.push(key); });
  return keys;
}

function d3_map_size() {
  var size = 0;
  for (var key in this) if (key.charCodeAt(0) === d3_map_prefixCode) ++size;
  return size;
}

function d3_map_empty() {
  for (var key in this) if (key.charCodeAt(0) === d3_map_prefixCode) return false;
  return true;
}