A Typed array of functions

Question

I\'m struggling to figure out if it\'s possible in TypeScript to declare a statically typed array of functions.

For example, I can do this:

foo: (data:st         


        

Answer 1

Other (newer, more readable) ways to type an array of functions using fat arrows:

let foo: Array<(data: string) => void>;
let bar: ((data: string) => void)[];

Answer 2

You can find this in the language spec section 3.5.5:

foo: { (data: string): void; } []

Answer 3

or foo: ((data: string) => void)[]

Answer 4

If you wish declare an array of callable function in TypeScript, you can declare a type:

type Bar = (
  (data: string) => void
);

And then use it:

const foo: Bar[] = [];

const fooFn = (data: string) => console.log(data);
foo.push(fooFn);
foo.forEach((fooFn: Bar) => fooFn("Something");