Convert letters to squared equivalents and numbers to circled equivalents

borderify.rb

#!/usr/bin/env ruby
#
# Adds a border around all the arguments passed to this script.
#
# Example:
#
# $ borderify hello you
# => 🄷 🄴 🄻 🄻 🄾   🅈 🄾 🅄
  
LOOKUP_TABLE = {
  a: "🄰",
  b: "🄱",
  c: "🄲",
  d: "🄳",
  e: "🄴",
  f: "🄵",
  g: "🄶",
  h: "🄷",
  i: "🄸",
  j: "🄹",
  k: "🄺",
  l: "🄻",
  m: "🄼",
  n: "🄽",
  o: "🄾",
  p: "🄿",
  q: "🅀",
  r: "🅁",
  s: "🅂",
  t: "🅃",
  u: "🅄",
  v: "🅅",
  w: "🅆",
  x: "🅇",
  y: "🅈",
  z: "🅉",
  "0": "⓪",
  "1": "①",
  "2": "②",
  "3": "③",
  "4": "④",
  "5": "⑤",
  "6": "⑥",
  "7": "⑦",
  "8": "⑧",
  "9": "⑨",
}.freeze

print(
  ARGV.join(" ")
    .chars
    .map { LOOKUP_TABLE[_1.downcase.to_sym] || _1 }
    .join("\u202f") # no break thin space
)