ReadonlyArray在TypeScript中继承了什么类？(What class does ReadonlyArray inherit?)

ReadonlyArray在TypeScript中继承了什么类？(What class does ReadonlyArray inherit?)

我在TypeScript中有这个代码片段：

const arr: ReadonlyArray<string> = [ "123", "234" ]; arr.push("345");

TS编译器显示错误： Property 'push' does not exist on type 'ReadonlyArray<string>' 。 当然很明显我不能改变/改变这个数组，但问题是 - ReadonlyArray的基类是什么？ 它是否继承自标准的Array类？

I have this code snippet in TypeScript:

const arr: ReadonlyArray<string> = [ "123", "234" ]; arr.push("345");

TS compiler shows an error:

Property 'push' does not exist on type 'ReadonlyArray<string>'.

Of course, it's clear that I cannot change/alter this array. The question is: what is the base class for ReadonlyArray? Does it inherit from standard Array class?

最满意答案

https://www.typescriptlang.org/docs/handbook/interfaces.html表明

TypeScript附带一个ReadonlyArray<T>类型，与Array<T>相同，删除了所有变异方法，因此您可以确保在创建后不更改数组

如果你想要源，请转到

https://github.com/Microsoft/TypeScript/blob/master/src/lib/es5.d.ts#L978

（其定义在当前版本的第978行）。

https://www.typescriptlang.org/docs/handbook/interfaces.html states that:

TypeScript comes with a ReadonlyArray<T> type that is the same as Array<T> with all mutating methods removed, so you can make sure you don’t change your arrays after creation

If you want the source, head over to:

https://github.com/Microsoft/TypeScript/blob/master/src/lib/es5.d.ts#L978

(its definition is on the line 978 in the current version).