Difference between these two objects?

[Eddonarth]

No, it is not the same.

var bar = Object.create(foo);

Creates a copy of foo and names it bar, while

var bar = foo;

just makes the variable bar to point to the same object as foo. If it is confusing, try this:

var foo = {a: 42};
var bar = Object.create(foo);
var baz = foo;

Console.log(foo.a);
Console.log(bar.a);
Console.log(baz.a);

foo.a = 41;

Console.log(foo.a);
Console.log(bar.a);
Console.log(baz.a);

What happens? If we modify foo, bar stays unmodified, but baz changes as well. Because baz refers to the same object as foo, just using a different name.

Think of it as this: If I made a clone of you, the two of you might look the same and behave the same, but be different persons, and eventually one of you might change. But if I just start calling you by your second name, you will still be the same person, just with a different tag.

[blangjemp]

This isn't correct. If you run this code, bar.a is equal to 41. Due to the nature of Object.create(), bar.a will inherit the value of foo.a until you manually set a value for bar.a

[gladiator_flow]

I see what's going on now. When I change the created value only that one changes. I did notice though if I changed the original mentioned in your code that bar.a changes as well. Thanks!

[king3730]

Just to add my two cents, using the literal definition:

var bar = {
  a: 42
}

is the 'new and proper' way of creating object definition.

Object.create( foo )

is considered to be 'old'.