Elegant way to copy only a part of an object [duplicate]

Answer 1

You can try reduce over [x,y,z] array:

let source = {
    x: 120,
    y: 200,
    z: 150,
    radius: 10,
    color: 'red',
};

const coords = ['x','y','z'].reduce((a,c) => Object.assign(a,{[c]: source[c]}), {});

console.log(coords);