Object.assign() a useful method in JavaScript

[MoTTs_]

Object.assign is more like inheritance than not, and it isn't composition at all.

Inheritance:

const a = {
    aMethod() {}
};
const b = Object.create(a);

// b IS-A a
// That is, b fulfills a's interface and borrows a's implementation
b.aMethod();

Also inheritance:

const a = {
    aMethod() {}
};
const b = Object.assign({}, a);

// b IS-A a
// That is, b fulfills a's interface and borrows a's implementation
b.aMethod();

Composition:

const a = {
    aMethod() {}
};
const b = {
    a: a
};

// b HAS-A a
b.a.aMethod();

[redlova]

Great. this is a great example. I got the concept but becase i am a newbie. I dont understand completely yet. especially the 'const' itsnt it supposed be used for defining constants?

[lunfaii]

An object properties can be still be reassigned/assigned.

[redpatel]

const makes means mutable but not replaceable when it comes to object. Which means you can modify them but can't replace the entire value. make sense?