TypeScript: is there an interface for array-like object?

Question

Suppose I know that I have array like ['string', 10, true];. Is there a way to write an interface for it? I know there's globally indexed interface:

interface IEntry {
    [i:number]:string;
}

But typing the following is not working:

interface IEntry {
    [0]:string;
    [1]:number;
    [2]:boolean;
}

Martin · Accepted Answer · 2015-05-24 13:06:25Z

3

Yes. Typescript tuples.

type Entry: [string, number, boolean];

var entry: Entry = ['foo', 1, false]; 
var exit: Entry = ['bar']; // tsc error

answered May 24, 2015 at 13:06

Martin

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1 Comment

rakslice Over a year ago

Spec at github.com/Microsoft/TypeScript/blob/master/doc/…

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