TypeScript casting arrays

Question

I'm trying to use a wrapper for a library that wants an Array as an input parameter.

I tried casting the Array, but I get an error: Cannot convert 'any[]' to 'Array'

Is there a way to make this work?

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

Answer 1

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.

Answer 2

I think the right syntax is:

var rows2 = <Array<any>>rows; 

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