Monad-ish Maybe in JS

example.js

var good = {a: {b: {c: 1}}}

console.log(new Maybe(good).bind(t=>t.a).bind(t=>t.b).bind(t=>t.c).getOrElse(2))

var bad = {a: 3}

console.log(new Maybe(bad).bind(t=>t.a).bind(t=>t.b).bind(t=>t.c).getOrElse(2))

maybe.js

const None = {}
const isNone = (t) => t === None || t === null || typeof t === 'undefined'

class Maybe {
  constructor(val) {
    this.val = isNone(val) ? None : val
  }
  getOrElse(defaultVal) {
    return this.val === None ? defaultVal : this.val
  }
  bind(f) {
    const toWrap = this.val === None ? None : f(this.val)// Hmm, maybe this should just be f(this.val)   ¯\_(ツ)_/¯
    return toWrap instanceof Maybe ? toWrap : new Maybe(toWrap)
  }
}

See it live @ https://babeljs.io/repl/#?babili=false&evaluate=true&lineWrap=false&presets=es2015%2Creact%2Cstage-2&targets=&browsers=&builtIns=false&debug=false&code=const%20None%20%3D%20%7B%7D%0Aconst%20isNone%20%3D%20(t)%20%3D%3E%20t%20%3D%3D%3D%20None%20%7C%7C%20t%20%3D%3D%3D%20null%20%7C%7C%20typeof%20t%20%3D%3D%3D%20'undefined'%0A%0Aclass%20Maybe%20%7B%0A%20%20constructor(val)%20%7B%0A%20%20%20%20this.val%20%3D%20isNone(val)%20%3F%20None%20%3A%20val%0A%20%20%7D%0A%20%20getOrElse(defaultVal)%20%7B%0A%20%20%20%20return%20this.val%20%3D%3D%3D%20None%20%3F%20defaultVal%20%3A%20this.val%0A%20%20%7D%0A%20%20bind(f)%20%7B%0A%20%20%20%20const%20toWrap%20%3D%20f(this.val)%0A%20%20%20%20return%20toWrap%20instanceof%20Maybe%20%3F%20toWrap%20%3A%20new%20Maybe(toWrap)%0A%20%20%7D%0A%7D%0A%0Avar%20good%20%3D%20%7Ba%3A%20%7Bb%3A%20%7Bc%3A%201%7D%7D%7D%0A%0Aconsole.log(new%20Maybe(good).bind(t%3D%3Et.a).bind(t%3D%3Et.b).bind(t%3D%3Et.c).getOrElse(2))%0A%0Avar%20bad%20%3D%20%7Ba%3A%203%7D%0A%0Aconsole.log(new%20Maybe(bad).bind(t%3D%3Et.a).bind(t%3D%3Et.b).bind(t%3D%3Et.c).getOrElse(2))

If there is no difference, then why write longer?? )))

var obj = {a: {b: {c: 1}}};
var value = obj?.a?.b?.vvv ?? 'else';