Safe Spot : help me

Adventurer
1

I don’t know why it’s not working
Can you help me please??

// Shout to activate the  bombs and move to the entrance.

// The function checks if numbers are almost equal.
function almostEqual(n1, n2) {
    return Math.abs(n1 - n2) <= 0.5;
}

// The function checks that all 
// thangs are on the same distance from the hero.
function allSameDistance(thangs) {
    if (thangs.length === 0) {
        return true;
    }
    // We can use any thang as an etalon.
    var etalon = hero.distanceTo(thangs[0]);
    // Iterate all thangs:
    for(var x = 0 ; x <= thangs.length ; x++){
        var thang = thangs[x];
         // Use almostEqual to check if not the distance
        // between the unit and the etalon:
        var distance = hero.distanceTo(thang);
        if (!(almostEqual(distance, etalon))){
            // Return false.
            return false;
        }
    }
       
    // All the same. Return  true.
    return true;
}

var bombs = hero.findEnemies();
for (var x = 36; x <= 44; x++) {
    for (var y = 30; y <= 38; y++) {
        hero.moveXY(x, y);
        if (allSameDistance(bombs)) {
            // It's a safe spot. Rock'n'Roll!
            hero.say("HEEEEEEEEEY!!!");
            hero.moveXY(40, 56);
        }
    }
}

hero.say("Heh. Nothing.");
```
2

If you have

var a = [1, 2, 3];
hero.say(a[3]);

What will be the output? Is this expression right?

 for(var x = 0 ; x <= thangs.length ; x++)