In OOP it would probably be this:
class CatLookup { byName = new Map byId = new Map add(cat) { this.byName.set(cat.name, cat) this.byId.set(cat.id, cat) } addMany(cats) { for (const cat of cats) this.add(cat) } constructor(cats = []) { this.addMany(cats) } } const c = new CatLookup([ { name: "Aeris", id: 0x00, isFavourite: true }, { name: "Juri", id: 0x01 }, { name: "Dante", id: 0x03 }, { name: "Frankenstein", id: 0xff } ])
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In OOP it would probably be this: