类型脚本转换数组

我试图为一个需要 Array 作为输入参数的库使用一个包装器。

我尝试强制转换 Array，但是得到一个错误: 无法将‘ any []’转换为‘ Array’

有办法解决吗？

var rows = new Array(10);
var rows2 = <Array>rows; //<--- Cannot convert 'any[]' to 'Array'

121212 次浏览

小开

I think this is just a bug - can you log an issue on the CodePlex site?

As a workaround, you can write <Array><any>rows;

小开

I think the right syntax is:

var rows2 = <Array<any>>rows;

That's how you cast to interface Array<T>

小开

There are 4 possible conversion methods in TypeScript for arrays:

let x = []; //any[]


let y1 = x as number[];
let z1 = x as Array<number>;
let y2 = <number[]>x;
let z2 = <Array<number>>x;

The as operator's mostly designed for *.tsx files to avoid the syntax ambiguity.

小开

A simple solution for all types

const myArray = <MyType[]>value;