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 = new Object();
UNITS[ZERG]    = [ZERGLING, ROACH, HYDRALISK, BANELING];
UNITS[TERRAN]  = [MARINE, HELLION, MARAUDER, REAPER, TANK];
UNITS[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[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],
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) continue;
    if (!BONUS[v].contains(u)) continue; // v must have bonus vs unit 
    if (u in BONUS && BONUS[u].contains(v)) continue; // unit must not have bonus vs v
    if (COUNTER[u].contains(v)) continue; // unit must not counter v
    if (!units.contains(v)) {
      units.push(v);
    } 
  }
  return units.sort();
}

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];
      if (u === v) continue;
      if (COUNTER[v].contains(u)) continue; // v must not counter unit
      if (v in BONUS && BONUS[v].contains(u)) continue; // v must not have bonus vs unit
      if (!units.contains(v)) {
        units.push(v);
      }
    }
  }
  
  return units.sort();
}

function describe (u) {
  var d = [];
  if (ARMORED.contains(u)) {
    d.push('armored');
  }
  if (LIGHT.contains(u)) {
    d.push('light');
  }
  if (BONUS[u] === ARMORED) {
    d.push('bonus vs armored');
  }
  if (BONUS[u] === LIGHT) {
    d.push('bonus vs light');
  }
  return d;
}

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];
    var desc = describe(unit);
    print("## "+unit+(desc?" ("+desc.join(', ')+")":""));
    print(" * strong against: "+(strong_against(unit).map(function (u) {return u+(unit in BONUS && BONUS[unit].contains(u)?' (bonus)':'');}).join(', ')||"None"));
    print(" * weak against: "+(weak_against(unit).map(function (u) {return u+(u in BONUS && BONUS[u].contains(unit)?' (bonus)':'');}).join(', ')||"None"));
    print("");
  }
}

counters.md

Zerg

Zergling (light)

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

Roach (armored)

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

Hydralisk (light)

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

Baneling (bonus vs light)

• strong against: Hellion (bonus), Hydralisk (bonus), Marine (bonus), Reaper (bonus), Sentry (bonus), Zealot (bonus), Zergling (bonus)
• weak against: Roach

Terran

Marine (light)

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

Hellion (light, bonus vs light)

• strong against: Hydralisk (bonus), Marine (bonus), Sentry (bonus), Zealot (bonus), Zergling (bonus)
• weak against: Baneling (bonus), Marauder, Roach, Stalker

Marauder (armored, bonus vs armored)

• strong against: Hellion, Roach (bonus), Stalker (bonus)
• weak against: Marine, Zealot, Zergling

Reaper (light, bonus vs light)

• strong against: Hydralisk (bonus), Marine (bonus), Sentry (bonus), Zealot (bonus), Zergling (bonus)
• weak against: Baneling (bonus), Siege Tank, Stalker

Siege Tank (armored, bonus vs armored)

• strong against: Hydralisk, Marine, Reaper, Roach (bonus), Zergling
• weak against: Immortal (bonus)

Protoss

Zealot (light)

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

Sentry (light)

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

Stalker (armored, bonus vs armored)

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

Immortal (armored, bonus vs armored)

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