Default value in ES6 unpacking

Not much magic there. It was just surprise to me that it works.

So simple tip: you can do this.

const o = { a: { someFn: () => "hello" } }

const { a: { someFn = () => "hello world by default" } } = o;
const { a: { someUndefFn = () => "hello world by default" } } = o;

someFn(); // "hello"
someUndefFn(); // "hello world by default"