What patterns of lights do these functions create?

onEvent("button1", "click", function(event) {
   flashRed();
   });

function flashRed() {
   for(var i=0;i<=10;i+=2){
      colorLeds[i].color("red");
      colorLeds[i+1].color("black");
   }
}

onEvent("button2", "click", function(event) {
   betterBlue(10);
 });

function betterBlue(j) {
   for(var i=0;i<=10;i++){
      colorLeds[i].color("blue");
      colorLeds[i].intensity(j);
   }
}