invalid.js

console.log({ ['foo' + 'bar']: '!!!' }) // { foobar: "!!!" }
//                           ^--- nice

const a = { foo: 1, bar: 2, foobar: 3 };

const delKey = (obj, name) => {
   const { [name], ...result } = obj;
   //            ^----- Syntax Error! :'(
   return result;
}

console.log(delKey(a, 'foo' + 'bar' )); // {foo: 1, bar: 2}

sample.js

const a = { foo: 1, bar: 2, foobar: 3};

const delKey = (obj) => {
   const { foobar, ...result } = obj;
   return result;
}

console.log(delKey(a)); // { foo: 1, bar: 2 }