Add property to object only if value is defined

Question

Is there a better way to add a property to an object only if the value is defined :

const destination = {};
const value = getValue();

if (_(value).isObject()) { // In this case, I only want an object
    destination.value = value;
}

In this case, the destination.value property exists only if value has a value. Is there a better way to do this ?

Answer 1

With ES6, I like to do conditional spreading:

const value = getValue()
const destination = {
  ...(value ? { value } : {})
}

And you can do whatever boolean check you need in the ternary. In your case, checking to see if value is an object.

Answer 2

Update

Here is a better way,

const destination = {};
const value = getValue();
destination = {
    ...destination, 
    ...value && ({value})
}

Here the assumption is you want to make a key with the name value itself.

Another approach

just do like this,

const destination = {};
const value = getValue();

value && (destination.value = value); // here is the one liner way

This will make sure that the value attribute is getting create only if value is defined