Create an empty object with a specific prototype

Question

I'm in the process of converting a classical OOP project to JS. Everything goes well and I just need to know if one of the methods I used has a shorthand/conventional way to achieve the same I did with it.

In my design I needs to create an empty object with a specific prototype. I used an empty dummy function as the constructorsince I needed an empty object. I can't use new Object() since I need to attach a prototype before the creation.

Here is my code:

var baseObj = {name: '', id: 0}

function emptyObj () {
    //this is really a dummy
}

emptyObj.prototype = Object.create(baseObj);

myUser = new emptyObj();

Please note that I have to follow this pattern and my project works very well with it. I just want to know if there is a shorthand/conventional method to create an empty object with a prototype.

Please stick to ES5.

Shorthand to those 2 lines of code? Wrap them in a function and it will be one line of code. — zerkms
– zerkms, Commented Dec 11, 2015 at 5:54
if (i==2) { foo = true}; can be foo = i ==2; A short hand method for 2 lines of code. It's not about the number of lines. It is about the concept and the quality of your code. — Charlie
– Charlie, Commented Dec 11, 2015 at 5:56

Bergi · Accepted Answer · 2015-12-11 06:47:41Z

1

I just want to know if there is a shorthand/conventional method to create an empty object with a prototype

Yes, there is one that does exactly this. And you've already used it. It's called Object.create.

Your code is exactly equivalent to

var baseObj = {name: '', id: 0};
myUser = Object.create(Object.create(baseObj));

I'm not sure though whether you really intended this two-level inheritance or whether a single invocation would be enough.

answered Dec 11, 2015 at 6:47

Bergi

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1 Comment

Charlie Over a year ago

Exactly! I should have thought of that. Thanks.

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