ES2022

[luoway]

模块顶层await

tc39/proposal-top-level-await

#x私有属性、私有方法

tc39/proposal-class-fields

#x in obj检查存在私有属性、方法

tc39/proposal-private-fields-in-in

class静态块

tc39/proposal-class-static-block

正则d修饰符

tc39/proposal-regexp-match-indices
新增d修饰符，可以让exec()、match()的返回结果添加indices属性，在该属性上面可以拿到匹配的开始位置和结束位置。

const text = 'zabbcdef';
const re = /ab/d;
const result = re.exec(text);

result.index // 1
result.indices // [ [1, 3] ]

err.cause

tc39/proposal-error-cause

const actual = new Error('an error!', { cause: 'Error cause' });
actual.cause; // 'Error cause'

str.at()、arr.at()

tc39/proposal-relative-indexing-method

const sentence = 'This is a sample sentence'

sentence.at(0); // 'T'
sentence.at(-1); // 'e'
sentence.at(100) // undefined

参考资料

• ES6 入门教程
• ecma-international 13.0