Generic concerns separation

example_state-behaviour.js

// benefits? disadvantages?

// state type-interface
type State = {
  name: string,
  age: number,
  gender: string,
  hobby: Array<string>
}
  
// Zod validator & Type<infer> on State

// state mutations
const changeGender = newAssignedGender: string => this.gender = newAssignedGender
const changeName = newAssignedName: string => this.name = newAssignedName
const haveNewHobby = newHobby: string => this.hobby.push(newHobby)
const abandonHobby = hobbyToRemove: string => this.hobby = this.hobby.filter(hobby => hobby!== hobbyToRemove)

// state getters
const getName = state: State => state.name
const getAge = state: State => state.age
const getGender = state: State => state.gender
const getHobby = state: State => state.hobby
const isOver18 = state: State => state.age >= 18
const getGenderPrefix = state: State => state.gender === 'M'? 'Mr.' : state.gender === 'F'? 'Mrs.' : 'Messrs'
const getNominative = state: State => `${getGenderPrefix} ${state.name}`

// behaviour interfaces
interface function name(params): object

// behaviors

function name(params: State) {
  // do something with params
}


const state: State = {
  name: 'Alfonso Purcicuddu',
  age: 54,
  gender: 'Q',
  hobby: []
}

name(state)
changeGender('M')
changeName('Bisboccio Purcicuddu')
console.log(`Hello getNominative(state)`)