[Solved] Is there a JavaScript proposal for an operator to apply a function to every item in a collection?

You could take a combination of

• Object.assign for building a new object of single objects as parts,

• spread syntax ... for taking an array as parameters,

• Object.entries for getting an array with key/value arrays,

• Array#map for doing the work with key and values,

• destructuring assignment for separating an array in key and value variables,

• computed property names for getting a new object with a given key.

var object = { a: 1, b: 2 },
    result = Object.assign(...Object.entries(object).map(([k, v]) => ({ [k]: v * 2 })));

console.log(result);