Object Properties
Bracket notation lets a property name come from a variable. Use it for names chosen at runtime.
Where to run this
This example uses the JavaScript console playground. Select Run to execute it; the example does not run on this lesson page.
A practical example
const session = {title: "Repair club", places: 12};
const field = "places";
console.log(session[field]);
What happens
The chosen property gives 12.