Question: What's the best way to extend a rule?

[Fernando Rojo]

Say I have this rule:

let rule = new RRule({ freq: RRule.WEEKLY })

What's the best way to "edit" the class, preferably immutably?

Should I do this?

let rule = new RRule({ freq: RRule.WEEKLY })

let newRule = new RRule({ ...rule.options, byweekday: [1] })

Thanks!