Starcraft 2 counters for basic units (node)

counters.js

var
  ZERGLING  = 'Zergling',
  ROACH     = 'Roach',
  HYDRALISK = 'Hydralisk',
  BANELING  = 'Baneling',
  MARINE    = 'Marine',
  HELLION   = 'Hellion',
  MARAUDER  = 'Marauder',
  REAPER    = 'Reaper',
  TANK      = 'Siege Tank',
  ZEALOT    = 'Zealot',
  SENTRY    = 'Sentry',
  STALKER   = 'Stalker',
  IMMORTAL  = 'Immortal';

var
  ZERG = 'Zerg',
  TERRAN = 'Terran',
  PROTOSS = 'Protoss';

var UNITS = {
  ZERG: [ZERGLING, ROACH, HYDRALISK, BANELING],
  TERRAN: [MARINE, HELLION, MARAUDER, REAPER, TANK],
  PROTOSS: [ZEALOT, SENTRY, STALKER, IMMORTAL]
};

var
  ARMORED = [ROACH, STALKER, MARAUDER, IMMORTAL, TANK],
  LIGHT   = [MARINE, HELLION, ZEALOT, HYDRALISK, ZERGLING, REAPER, SENTRY];

var BONUS = new Object();
BONUS[ROACH]    = ARMORED;
BONUS[STALKER]  = ARMORED;
BONUS[MARAUDER] = ARMORED;
BONUS[IMMORTAL] = ARMORED;
BONUS[TANK]     = ARMORED;
BONUS[BANELING] = LIGHT;
BONUS[HELLION]  = LIGHT;
BONUS[REAPER]   = LIGHT;


var COUNTER = new Object();

COUNTER[ZERGLING]  = [STALKER, MARAUDER, HYDRALISK, IMMORTAL, SENTRY],
COUNTER[ROACH]     = [ZEALOT, BANELING, HELLION, ZEALOT],
COUNTER[HYDRALISK] = [],
COUNTER[BANELING]  = [ZERGLING, MARINE, ZEALOT],
COUNTER[MARINE]    = [MARAUDER, HYDRALISK, IMMORTAL],
COUNTER[HELLION]   = [ZEALOT, ZERGLING, SENTRY],
COUNTER[MARAUDER]  = [HELLION, ROACH, STALKER],
COUNTER[REAPER]    = [ZEALOT, ZERGLING],
COUNTER[TANK]      = [MARINE, HYDRALISK, ZERGLING, REAPER],
COUNTER[ZEALOT]    = [MARAUDER, IMMORTAL, HYDRALISK],
COUNTER[STALKER]   = [REAPER, HELLION, SENTRY],
COUNTER[SENTRY]    = [],
COUNTER[IMMORTAL]  = [STALKER, ROACH, TANK]


function weak_against (u) {
  var units = [];
  for (var v in COUNTER) {
    if (COUNTER[v].contains(u)) {
      units.push(v);
    }
  }
  for (var v in BONUS) {
    if (u !== v && BONUS[v].contains(u) && !COUNTER[u].contains(v)) {
      units.splice(units.indexOf(v), 1, v+" (bonus)");
    }
  }
  return units.sort().join(", ") || "None";
}

function strong_against (u) {
  var units = COUNTER[u].concat();
  
  if (u in BONUS) {
    for (var i = 0; i < BONUS[u].length; i++) {
      var v = BONUS[u][i];
      units.splice(units.indexOf(v), 1, v+" (bonus)");
    }
  }
  
  return units.sort().join(", ") || "None";
}

Array.prototype.contains = function (o) {
  return this.indexOf(o) >= 0;
}

var sys = require('sys');
var print = function (s) { sys.print(s+"\n") };

for (var race in UNITS) {
  print("# "+race);
  for (var i = 0; i < UNITS[race].length; i++) {
    var unit = UNITS[race][i];
    print("## "+unit);
    print(" * strong against: "+strong_against(unit));
    print(" * weak against: "+weak_against(unit));
    print("");
  }
}

counters.md

ZERG

Zergling

• strong against: Hydralisk, Immortal, Marauder, Sentry, Stalker
• weak against: Baneling (bonus), Hellion (bonus), Reaper (bonus), Siege Tank

Roach

• strong against: Baneling, Hellion, Siege Tank (bonus), Zealot
• weak against: Marauder (bonus), Siege Tank (bonus)

Hydralisk

• strong against: None
• weak against: Marine, Reaper (bonus), Siege Tank, Zergling

Baneling

• strong against: Marine (bonus), Sentry (bonus), Zergling (bonus)
• weak against: Roach

TERRAN

Marine

• strong against: Hydralisk, Immortal, Marauder
• weak against: Baneling (bonus), Reaper (bonus)

Hellion

• strong against: Sentry (bonus), Zealot (bonus), Zergling (bonus)
• weak against: Marauder, Reaper (bonus), Roach

Marauder

• strong against: Hellion, Roach (bonus), Siege Tank (bonus)
• weak against: Marine, Siege Tank (bonus), Zergling

Reaper

• strong against: Sentry (bonus), Zealot (bonus)
• weak against: Hellion (bonus), Siege Tank

Siege Tank

• strong against: Hydralisk, Marine, Siege Tank (bonus), Zergling
• weak against: Immortal (bonus)

PROTOSS

Zealot

• strong against: Hydralisk, Immortal, Marauder
• weak against: Baneling (bonus), Hellion (bonus), Reaper (bonus), Roach

Sentry

• strong against: None
• weak against: Hellion (bonus), Reaper (bonus), Zergling

Stalker

• strong against: Hellion, Reaper, Siege Tank (bonus)
• weak against: Marauder (bonus), Siege Tank (bonus), Zergling

Immortal

• strong against: Roach (bonus), Siege Tank (bonus), Stalker (bonus)
• weak against: Marauder (bonus), Marine, Zergling