.set(newValue)

ts
Optic<A>.set: (a: A | ((prev: A) => A)) => void;

ts
Optic<A>.set: (a: A | ((prev: A) => A)) => void;

---

This method allows you to update the value focused by the optic.
You either pass it a value to replace the previous one, or an updater function that takes the previous value as argument and returns the next value.

Example:

ts
const statesOptic = createState([
  { name: "Virginia", capital: "Richmond", inhabitants: 8_535_519 },
  { name: "Illinois", capital: "Chicago", inhabitants: 12_812_508 },
]);
 
statesOptic[1].capital.set("Springfield");
 
statesOptic[0].name.set((prev) => prev.toUpperCase());
 
statesOptic.get();
// [
//   { name: 'VIRGINIA', capital: 'Richmond', inhabitants: 8_535_519 },
//   { name: 'Illinois', capital: 'Springfield', inhabitants: 12_812_508 }
// ];

ts
const statesOptic = createState([
  { name: "Virginia", capital: "Richmond", inhabitants: 8_535_519 },
  { name: "Illinois", capital: "Chicago", inhabitants: 12_812_508 },
]);
 
statesOptic[1].capital.set("Springfield");
 
statesOptic[0].name.set((prev) => prev.toUpperCase());
 
statesOptic.get();
// [
//   { name: 'VIRGINIA', capital: 'Richmond', inhabitants: 8_535_519 },
//   { name: 'Illinois', capital: 'Springfield', inhabitants: 12_812_508 }
// ];