How to provide default value in parameter?

Question

function x({ name = 'abc' }) {
  console.log(name);
}

x({ name: null })

How to provide default value for above case which handles all falsey value for name? I was expecting that when name: null will be replaced by abc but apparently not the case? It's only working in the below case

function x({ name = 'abc' }) {
  console.log(name);
}

x({  })

Wondering if it's possible to provide default value for all falsey value? Of course we can check for the condition explicitly but wondering if there is any alternatives

Answer 1

Default parameter values are only applied when the value is undefined. You'd have to implement such logic yourself.

function x({name}) {
  if (!name) {
    name = 'abc';
  }
  console.log(name);
}

x({ name: null })

Answer 2

null is intentional, undefined is not.

In other words, providing null means the value is null, so 'abc' will not be set as the default value.

This should do the trick:

function x({ name }) {
   !(!!name) && (name = 'abc'); 
      
   console.log(name);
}
    
x({ name: null })

Answer 3

How does redefining suits you in case, when the value was null?

function x({ name }) {
  name = name ? name : 'abc';
  console.log(name);
}

x({ name: null });
x({ name: 'asd' });