将嵌套对象解构为函数参数

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.

Answer 1

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; } 

Answer 2

Try this:

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

See also examples on MDN .

Answer 3

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' } } });