TypeScript 转换数组
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TypeScript casting arrays
提问by Adam Tegen
I'm trying to use a wrapper for a library that wants an Array as an input parameter.
我正在尝试为需要数组作为输入参数的库使用包装器。
I tried casting the Array, but I get an error: Cannot convert 'any[]' to 'Array'
我尝试投射数组，但出现错误：无法将 'any[]' 转换为 'Array'
Is there a way to make this work?
有没有办法使这项工作？
var rows = new Array(10);
var rows2 = <Array>rows; //<--- Cannot convert 'any[]' to 'Array'
回答by shadeglare
There are 4 possible conversion methods in TypeScript for arrays:
TypeScript 中有 4 种可能的数组转换方法：
let x = []; //any[]
let y1 = x as number[];
let z1 = x as Array<number>;
let y2 = <number[]>x;
let z2 = <Array<number>>x;
The asoperator's mostly designed for *.tsxfiles to avoid the syntax ambiguity.
该as运营商的主要设计*.tsx文件，以避免语法歧义。
回答by Tsvetomir Nikolov
I think the right syntax is:
我认为正确的语法是：
var rows2 = <Array<any>>rows;
That's how you cast to interface Array<T>
你就是这样投的 interface Array<T>
回答by Ryan Cavanaugh
I think this is just a bug - can you log an issue on the CodePlex site?
我认为这只是一个错误 - 您可以在 CodePlex 站点上记录问题吗？
As a workaround, you can write <Array><any>rows;
作为一种解决方法，您可以编写<Array><any>rows;
回答by Jayant Varshney
A simple solution for all types
适用于所有类型的简单解决方案
const myArray = <MyType[]>value;
