bit's quest #6 especially for IlyaF

bq6.js

if (!String.prototype.endsWith) {
    Object.defineProperty(String.prototype, 'endsWith', {
        enumerable: false,
        configurable: false,
        writable: false,
        value: function (searchString, position) {
            position = position || this.length;
            position = position - searchString.length;
            var lastIndex = this.lastIndexOf(searchString);
            return lastIndex !== -1 && lastIndex === position;
        }
    });
}

var stop = function(self) {
	self.thrusters.top(false);
	self.thrusters.left(false);
	self.thrusters.bottom(false);
	self.thrusters.right(false);
}

var strategy = [
	// start
	{
		"bottom": {
			true: "left"
		},
		"right": {
			true: "bottom"
		},
		"left": {
			true: "top",
			false: "right."
		}
	}, 
	{
		"left": {
			true: "bottom."
		},
	},
	{
		"top": {
			true: "left"
		},
		"right": {
			true: "top."
		}
	}, 
	{
		"left": {
			true: "left"
		},
		"right": {
			true: "bottom."
		}
	},
	{
		"right": {
			true: "bottom",
			false: "left"
		}
	}
]

var tactic = 0;

this.on("all", function(){
	var args = [].slice.call(arguments, 0),
		match = args[0].match(/sensor\:(.+)$/);

	if (match && match[1]) {
		if (match[1] in strategy[tactic] && args[1] in strategy[tactic][match[1]]) {
			stop(this);
			var new_action = strategy[tactic][match[1]][args[1]]

			if (new_action.endsWith(".")) {
				tactic += 1;
				console.log("switching strategy");
				new_action = new_action.replace(".", "");
			}

			if (new_action in this.thrusters) {
				this.thrusters[new_action](true);
			}
		}
	}
});

this.on("start", function() {
	this.thrusters.top(true);
});