is-jeju-or-is-island-and-mountain

국내 우편번호 -> 제주도 및 도서산간 식별기.
Identifier which confirms whether a Korean zip code is on the Jeju province, or island + mountain regions.

Installing

Using npm:
$ npm install is-jeju-or-is-island-and-mountain

Using yarn:
$ yarn add is-jeju-or-is-island-and-mountain

Methods

isJeju(zipcode): takes in zip code string as input and returns boolean value

isMountain(zipcode): takes in zip code string as input and returns boolean value