Warrior JS code

warrior.js

let exploreState = {
  execute: function(player,warrior) {
    if (player.sense(warrior) === 'empty') {
      warrior.walk(player.direction);
    }
    else if (player.sense(warrior) === 'wall') {
      warrior.pivot();
    }
    else if (player.sense(warrior) === 'enemy') {
      warrior.think("It's time to kick ass and chew bubble gum...");
      warrior.think("and I'm all out of gum.");
      player.changeState(meleeAttackState,warrior); 
    }
    else if (player.sense(warrior) === 'captive') {
      warrior.think("What do you say to some champaigne, huh, baby.");
      player.changeState(rescueState,warrior);
    }
  }
}

let meleeAttackState = {
  execute: function(player,warrior) {
    if (player.sense(warrior) === 'enemy') {
      warrior.attack(player.direction);
    }
    else { 
      warrior.think("Nobody goes out that door! Not until daylight!!");
      player.changeState(cautiousState,warrior); 
    }
  }
}

/*
let rangedAttackState = {
  execute: function(player,warrior) {
    if (player.sense(warrior) === 'enemy') {
      warrior.shoot(player.direction);
    }
    else { 
      warrior.think("Me and ol' double barrel here will blow your butts to kingdom come!! See if we don't!");
      player.changeState(cautiousState,warrior); 
    }
  }  
}
*/

let cautiousState = {
  execute: function(player,warrior) {
    if (warrior.health() < player.health) {
      warrior.think("I made a mistake...wait, wait!! No, I made a mistake!");
      player.switchDirection();
      player.changeState(retreatState,warrior);
    }
    else if (player.sense(warrior) === 'empty' && warrior.health() < warrior.maxHealth()) {
      warrior.rest();
    }
    else { 
      warrior.think("Groovy. Those pages are down there somewhere.");
      player.changeState(exploreState,warrior); 
    }
  }
}

let retreatState = {
  execute: function(player,warrior) {
    if (warrior.health() < player.health) {
      warrior.think("You...bastards! You dirty bastards!");
      warrior.walk(player.direction);
    }
    else if ( warrior.health() < warrior.maxHealth()) {
      warrior.rest();
    }
    else { 
      warrior.think("Uh-huh, that's right. Who's laughing now? Who's laughing now?!");
      player.switchDirection();
      player.changeState(exploreState,warrior); 
    }
  } 
}

let chargeState = {
  execute: function(player,warrior) {
    if (player.sense(warrior) === 'empty') {
      warrior.walk(player.direction);
    }
    else {
      warrior.think("Swallow this.");
      player.changeState(meleeAttackState,warrior);
    }
  }
}

let rescueState = {
  execute: function(player,warrior) {
    if (player.sense(warrior) === 'captive') {
      warrior.rescue(player.direction);
    }
    else {
      warrior.think("Feels like...somebody just walked over my grave.")
      player.changeState(cautiousState,warrior);
    }
  }
}

class Player {
  constructor() {
    this.state = exploreState;
    this.health = 20;
    this.direction = 'forward';
  }
  playTurn(warrior) {
    this.state.execute(this,warrior);
    this.health = warrior.health();
  }
  changeState(newState,warrior) {
    this.state = newState;
    this.playTurn(warrior);
  }
  sense(warrior) {
    let space = warrior.feel(this.direction);
    return this.getSpaceType(space);
  }
  scout(warrior){
    let spaces = warrior.look(this.direction);
    return spaces.map(s=>this.getSpaceType(s));
  }
  switchDirection() {
    if (this.direction === 'forward') {
      this.direction = 'backward';
    } 
    else {
      this.direction = 'forward';
    }
  }
  getSpaceType(space) {
    if (space.isEmpty()) {
      return 'empty';
    }
    else if (space.isWall()) {
      return 'wall';
    }
    else if (space.getUnit().isEnemy()) {
      return 'enemy';
    }
    else if (space.getUnit().isBound()) {
      return 'captive';
    }
  }
}