How to get a subset of a javascript object's properties

Question

Say I have an object:

elmo = {    color: 'red',   annoying: true,   height: 'unknown',   meta: { one: '1', two: '2'} }; 

I want to make a new object with a subset of its properties.

 // pseudo code  subset = elmo.slice('color', 'height')   //=> { color: 'red', height: 'unknown' } 

How may I achieve this?

Answer 1

Using Object Destructuring and Property Shorthand

const object = { a: 5, b: 6, c: 7  };  const picked = (({ a, c }) => ({ a, c }))(object);    console.log(picked); // { a: 5, c: 7 }

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From Philipp Kewisch:

This is really just an anonymous function being called instantly. All of this can be found on the Destructuring Assignment page on MDN. Here is an expanded form

let unwrap = ({a, c}) => ({a, c});    let unwrap2 = function({a, c}) { return { a, c }; };    let picked = unwrap({ a: 5, b: 6, c: 7 });    let picked2 = unwrap2({a: 5, b: 6, c: 7})    console.log(picked)  console.log(picked2)