Null & Undefined | 空类型
Type Coercion | 类型转换
Codec | 编码
Regular Expressions | 正则表达式
2015-New regular expression features in ECMAScript 6: This blog post explains new regular expression features in ECMAScript 6.
Regular Expressions in a post-ES6 world: In this article we’ll take a look at regular expressions in and after ES6. There’s a couple of regular expressions flags which were introduced in ES6: the /y or sticky flag, and the /u or Unicode flag. Then we’ll discuss five proposals which are making their way through the ECMAScript specification development process at TC39.