bugFarm.js

let someProperty, someOtherProperty;

function setProperty(target, propertyName, value) {
  target[propertyName] = value;
}

function getProperty(target, propertyName) {
  return target[propertyName];
}

const a = {foo: 'bar'};

somePorperty = 'someProperty';
someOtherPorperty = 'someOtherProperty'

setProperty(a, someProperty, 42);
setProperty(a, someOtherProperty, 'hello world');

console.log(getProperty(a, someProperty)); // outputs: "hello world"