100doors.js

function DoorsWorld(passes){
    this.doors = []
    this.passes = passes
    
    for(var i = 0; i < 100;i++){
        this.doors.push({
            number:++i,
            state:'closed'
        })
    }
}

DoorsWorld.prototype.countOpen = function(){
    return this.doors.filter(function(door){
        return door.state === 'opened'
    });
}

DoorsWorld.prototype.countClosed = function(){
    return this.doors.filter(function(door){
        return door.state === 'closed'
    });
}

DoorsWorld.prototype.runPass = function(){
    for(var i = 0; i <= this.passes; i++){
        this.doors.forEach(function(door, index){
            if(index === i){
                door.state = door.state ? 'closed' : 'opened'
            }
            
            
        })
    }
    
    return this.doors
}




var dw = new DoorsWorld(5)

dw.runPass()