Conditional (ternary) Operator

basic.js

var func = function (arg) {
  if (arg.yes) {
    return 'yes'
  }
  else if (arg.no) {
    return 'no'
  }
  else if (arg.probably) {
    return 'probably'
  }
  else {
    return null
  }
}
console.log(func({yes: true}))
console.log(func({no: true}))
console.log(func({probably: true}))
console.log(func({}))

logical.js

var func = function (arg) {
  return true &&
    (arg.yes &&
      'yes'
    || (arg.no &&
      'no'
    || (arg.probably &&
      'probably'
    || null)))
}
console.log(func({yes: true}))
console.log(func({no: true}))
console.log(func({probably: true}))
console.log(func({}))

ternary.js

var func = function (arg) {
  return true &&
    (arg.yes ?
      'yes'
    : (arg.no ?
      'no'
    : (arg.probably ?
      'probably'
    : null)))
}
console.log(func({yes: true}))
console.log(func({no: true}))
console.log(func({probably: true}))
console.log(func({}))