Destructuring nested objects as function parameters

Question

In ES6 we can do:

let myFunc = ({name}) => {
  console.log(name)
}

myFunc({name:'fred'}) // => logs 'fred'

But how do I do it for nested properties like this:

myFunc({event:{target:{name:'fred'}}}) // => I want it to log 'fred'

What should myFunc look like so that it logs 'fred'?

I cannot change the object passed in. I wish to use destructuring to achieve this or some other suitable ES6 approach.

Do you know the structure of name? Or are you wanting to log all values? — Adam Paxton
– Adam Paxton, Commented Jun 12, 2017 at 15:39
the object structure is show ... event.target.name ... i just want to log the value of event.target.name using ES6 destructuring if possible — danday74
– danday74, Commented Jun 12, 2017 at 15:40

john · Accepted Answer · 2017-06-13 23:03:09Z

16

You can simply do like this:

const myFunc = ({event: {target: {name}}}) => {
  console.log(name)
}

myFunc({event: {target: {name: 'fred'}}})

.as-console-wrapper { max-height: 100% !important; top: 0; }

Here is an other implementation, with both in parameters, but the second is entirely optionnal:

const myFunc = (
      {name: name},
      {event: {target: {name: eventTargetName = ''} = ''} = ''} = ''
    ) => {
      console.log(name, eventTargetName)
    }

myFunc({name:'fred'})
myFunc({name:'papi'}, {event: {target: {name: 'fredo'}}})

.as-console-wrapper { max-height: 100% !important; top: 0; }

edited Jun 13, 2017 at 23:03

answered Jun 12, 2017 at 15:44

john

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Comments

Michał Perłakowski · Accepted Answer · 2017-06-12 15:43:38Z

3

Try this:

let myFunc = ({ event: { target: { name } } }) => {
  console.log(name);
};

myFunc({ event: { target: { name:'fred' } } }); // => logs 'fred'

Comments

Adam Paxton · Accepted Answer · 2017-06-12 16:19:56Z

1

You can do:

let myFunc = ( obj ) => {
    console.log(obj.event.target.name);
};

myFunc({ event: { target: { name: 'fred' } } });

Or:

let myFunc = ( {event: {target: { name } } } ) => {
    console.log(name);
};

myFunc({ event: { target: { name: 'fred' } } });

edited Jun 12, 2017 at 16:19

answered Jun 12, 2017 at 15:46

Adam Paxton

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1 Comment

Michał Perłakowski Over a year ago

OP asked for solution with destructuring or some other ES 6 approach.

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