Array destructuring in parameters list, with TypeScript

Question

Using TypeScript, I am trying to figure out how to do array destructuring in the arguments list.

We can use object destructuring like so:

let foo = function({firstname, lastname}){...}

foo({
  firstname: 'ralph',
  lastname: 'lauren'
});

I am wondering if we can do the same thing with array destructuring, it would be very useful for me, something like:

let bar = function([desc, opts, fn]){...}

bar([
  'yes',
   {},
   function(){}
]);

is it possible to do this with an array with TypeScript?

Answer 1

An array of fixed length and types is also called a tuple in TS. We can destructure a tuple argument like:

let bar = function ([desc, opts, fn]: [string, {}, Function]) {


}

bar([
    'yes',
    {},
    function () { }
]);