Immutable.js 2.2.2 发布，不可变数据集合

第29期OSC源创会#南京#开始报名，AngularJS、Netty 等

Immutable.js 2.2.2 发布，此版本现已提供下载，更新内容如下：

• Improved using arbitrary Objects as keys or as members of a Set for IE8.

• Fixed: collections did not always return correct length iterated from forEach()

• Sequences (and Maps, Vectors, and Sets) can now be constructed from Iterables and Iterators. This enables Map and Set construction similar to ES6 spec.

var m = new Map([['A', 1], ['B', 2], ['C', 3]]);// Map {"A" => 1, "B" => 2, "C" => 3}var im = Immutable.Map(m);// Map { A: 1, B: 2, C: 3 }m = new Map(im);// Map {"A" => 1, "B" => 2, "C" => 3}

• Fixed: some Sequences did not properly provide themselves as the 3rd argument in iteration.

• Fixed: take() could iterate one step too far.

• Fixed: getIn() could throw if one of the intermediate keys does not exist.

Immutable 是 Facebook 开发的不可变数据集合。不可变数据一旦创建就不能被修改，是的应用开发更简单，允许使用函数式编程技术，比如惰性评估。Immutable JS 提供一个惰性 Sequence，允许高效的队列方法链，类似 map 和 filter ，不用创建中间代表。

immutable 通过惰性队列和哈希映射提供 Sequence, Range, Repeat, Map, OrderedMap, Set 和一个稀疏 Vector。