Get Victorian State code based on a postcode

postcodeToState.js

const postcode = 9999
let state
if (
  (postcode >= 1000 && postcode <= 2599) ||
  (postcode >= 2619 && postcode <= 2899) ||
  (postcode >= 2921 && postcode <= 2999)
) {
  state = 'NSW'
} else if (
  (postcode >= 200 && postcode <= 299) ||
  (postcode >= 2600 && postcode <= 2618) ||
  (postcode >= 2900 && postcode <= 2920)
) {
  state = 'ACT'
} else if (
  (postcode >= 3000 && postcode <= 3999) ||
  (postcode >= 8000 && postcode <= 8999)
) {
  state = 'VIC'
} else if (
  (postcode >= 4000 && postcode <= 4999) ||
  (postcode >= 9000 && postcode <= 9999)
) {
  state = 'QLD'
} else if (
  (postcode >= 5000 && postcode <= 5999)
) {
  state = 'SA'
} else if (
  (postcode >= 6000 && postcode <= 6999)
) {
  state = 'WA'
} else if (
  (postcode >= 7000 && postcode <= 7999)
) {
  state = 'TAS'
} else if (
  (postcode >= 800 && postcode <= 999)
) {
  state = 'NT'
}