打字稿数组与任何[] [英] Typescript Array vs any[]

问题描述

在TypeScript中，数组和任何[] 之间有什么区别？ Array是否引用动态大小的数组（当然是在编译时）和 any [] 是指作为参数传递的静态大小的数组并由编译器输入类型？因为目前我有以下函数：

In TypeScript, what is the difference between Array and any[]? Does Array refer to dynamically sized arrays (during compile-time, of course) and any[] refer to statically sized arrays passed as arguments and type-inferred by the compiler? Because currently when I have functions such as:

mergeArrays(arr1 : Array, arr2 : Array);

当您使用静态数据调用此函数时，TypeScript使用类型化数组（键入[] ）。

When you call this function with static data, TypeScript uses a typed array (type[]).

mergeArrays([true, false],  [1, 2]);
//          bool[]          number[]

那么编译时是否有任何差异？ 2？我何时使用任何[] ，何时使用数组？有时使用 Array定义变量 ..

So are there any compile-time differences between the 2? When do I use any[] and when do I use Array? Sometimes defining vars with Array..

var info:Array;

..在设置如下时显示无法将任何[] []转换为数组的错误：

..show errors like "Cannot convert any[][] to Array" when setting as follows:

info = [[], []];

推荐答案

规范第3.5.4节规定了他们的关系：

Spec section 3.5.4 specifies their relationship:

格式的数组类型ElementType [] 相当于一个对象类型索引签名 [index：number]：ElementType 加上一组等同于全局接口类型 Array 的成员，其中所有出现魔法 _element 类型替换为 ElementType 。

An array type of the form ElementType[] is equivalent to an object type with the index signature [index: number]: ElementType plus a set of members equivalent to the global interface type Array where all occurrences of the magic _element type are replaced with ElementType.

无法分配 [[]，[]] 或 [] 到数组是一个错误。

Not being able to assign [[], []] or [] to Array is a bug.

TypeScript中没有静态大小数组的概念。他们都在谈论相同的底层JavaScript数组（动态大小）：

There is no notion of a "statically-sized" array in TypeScript. They're all talking about the same underlying JavaScript array (which is dynamically sized):

var x = [1, 2];
x.push(3);
x[13] = 5;

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