2023年6月29日,

ECMAScript 2023搜索和添加新方法改变数组,可以用作WeakMap符号键和标准化支持hashbang语法。Bigc工作室/伤风ECMAScript 2023,一个更新的官方规范JavaScript编程语言,已经认可了ECMA国际。新规范搜索和改变数组添加新方法,扩展了WeakMap API允许独特的符号,并介绍一些标准化hashbangs的使用。6月27日,ECMAScript批准2023规范引用以下简介的改进:ECMAScript 2023年第14版,介绍了toSorted,去逆转,findLast, findLastIndex数组的方法。原型和TypedArray。原型,以及toSpliced Array.prototype方法;添加支持# !评论一开始的文件,以便更好地促进可执行ECMAScript文件;并允许使用大多数符号键弱集合。完成提案,发表的ECMA TC39(39)技术委员会在GitHub,详细说明今年出版的四个特性:数组找到从去年,提议.findlast()和.findLastIndex()方法在阵列和类型化数组。数组中查找一个元素是一个非常常见的编程模式,这个提议。 Scenarios under which this feature would be used include when a developer knows that finding an element from last to first may have better performance, or developers care about the order of the elements. Permitting symbols as keys in WeakMap keys , a proposal that extends the WeakMap API to allow the use of unique symbols as keys. Currently, WeakMaps are limited to allow only objects as keys. Change array by copy , a proposal that provides additional methods on Array.prototype and TypedArray.prototype to enable changes on the array by returning a new copy of it with the change. Hashbang grammar , a proposal to match the de facto usage in some CLI JS hosts that allow for Shebangs/Hashbang . These hosts strip the hashbang to generate valid JS source texts before passing to JS engines. This plan would move the stripping to engines and unify and standardize how that is done. Updated versions of ECMAScript traditionally are finalized by ECMA in June. Last year’s ECMAScript 2022 featured class elements and top-level await capabilities. Next read this: