Wrapping instead of currying

flux.ts

import { 
	State,
	set_age,
} from './state.ts'


const state: State = { ... }

// currying
const curried1_set_age = change_age.bind(null, state) // hard to read
curried1_set_age(42) // we are loosing the return value, so it's useless

// wrapping: much better:
// - more readable
// - can do more than just patching a param at the beginning or the end
const curried2_set_age = (age: Parameters<set_age>[1]) => {
	state = set_age(state, age)
}
curried2_set_age(42) // global state was updated

state.ts

// modern code using immutable public data structures
// instead of outdated OOP ;)

export interface State {
	name: string
	age: number
}

export function set_age(state: Readonly<State>, age: number): Readonly<State> {
	return {
			...state,
			age,
		}
}