Es6 distructing part 3

Object Destructuring in ES6

Similar to Array destructuring, Object destructuring unpacks properties into distinct variables.
For example:

let obj = {h:100, s: true};
let {h, s} = obj;

console.log(h); // 100
console.log(s); // trueTry It Yourself

We can assign without declaration, but there are some syntax requirements for that:

let a, b;
({a, b} = {a: 'Hello ', b: 'Jack'});

console.log(a + b); // Hello JackTry It Yourself

The () with a semicolon (;) at the end are mandatory when destructuring without a declaration. However, you can also do it as follows where the () are not required:

let {a, b} = {a: 'Hello ', b: 'Jack'};
console.log(a + b);Try It Yourself

You can also assign the object to new variable names.
For example:

var o = {h: 42, s: true};
var {h: foo, s: bar} = o;

//console.log(h); // Error
console.log(foo); // 42Try It Yourself

Finally you can assign default values to variables, in case the value unpacked from the object is undefined.
For example:

var obj = {id: 42, name: "Jack"};

let {id = 10, age = 20} = obj;

console.log(id); // 42
console.log(age); // 20Try It Yourself

Tap Try it Yourself to play around with the code.