My hero keeps running straight into the traps but i did everything right 
// Goal: build three rows of nine fire-traps.
// Returns "retreat", "attack", "start-next-trap-column", or "build-next-trap-in-column"
function chooseStrategy() {
var enemies = hero.findEnemies();
// If there are overwhelming ogre forces, return the "retreat" strategy.
if(enemies.length > 20) {
return "retreat";
}
// If there are some ogres, return the "attack" strategy.
if (enemies.length > 0) {
return "attack"
}
// Use x % 9 === 0 to see if x is divisible by 9.
// Use this.built.length to see how many traps you have built.
// If you have finished a column of 9 traps, return "start-next-trap-column"
if (hero.built.length % 9 === 0) {
return "start-next-trap-column"
}
// Otherwise, return "build-next-trap-in-column"
else {
return "build-next-trap-in-column";
}
}
var trapsInColumn = 9;
var startX = 40;
var columnX = startX;
// Build the next trap in a column in the correct place.
function buildNextTrapInColumn(columnX,numTraps) {
// Change newY to use % to wrap around and only build trapsInColumn (9) traps per column
var newY = 7 * (numTraps & trapsInColumn) + 10; // ∆ Change this to use % 9!
if (hero.pos.y < newY) {
hero.move({"x": columnX - 5, "y": newY});
} else {
buildTrap(columnX,newY);
}
}
// Start a new column of traps.
function startNextTrapColumn(columnX, numTraps) {
var newX = startX - (Math.floor(numTraps / trapsInColumn) * 6);
if (hero.pos.y > 10) {
hero.move({"x": newX - 5, "y": 10});
return columnX;
} else {
buildTrap(newX,10);
return newX;
}
}
function buildTrap(x, y) {
hero.buildXY("fire-trap", x, y);
}
function commandAttack() {
// Have your griffin riders fend off the attackers.
var friends = hero.findFriends();
for(var i = 0; i < friends.length;i++) {
var friend = friends[i]
hero.command(friend, "attack", friend.findNearestEnemy());
}
}
function commandRetreat() {
hero.say("Retreat!");
// You and your griffin riders retreat to safety behind the traps.
hero.moveXY(4, 42);
for(var i = 0; i < friends.length;i++) {
var friend = friends[i]
hero.command(friend, "move", hero.pos);
}
}
while(true) {
var strategy = chooseStrategy();
if(strategy == "attack") {
commandAttack();
} else if(strategy == "build-next-trap-in-column") {
buildNextTrapInColumn(columnX, hero.built.length);
} else if(strategy == "start-next-trap-column") {
columnX = startNextTrapColumn(columnX, hero.built.length);
} else if(strategy == "retreat") {
commandRetreat();
}
}
