Replacing a for loop with a variable that is initialized to zero before the loop and updated within the loop

replaceForWithVar.js

var y = 0;
  //Column Two
  for (i=63; i<128; i+=1){ //i variable stands for alpha value
													//the loop adds one to the alpha value until it equals 176
    //for (var y=0; y<=630; y+=10){ //y variable stands for the y coordinate of rectangle
																 //the loop adds 10 to the y coordinate until it equals 630
    fill(255, 0, 0, i);
  	rect(30, y, 20, 5); //I added 30 to the x coordinate of the rectangle to
											 //add space between the columns
    y+=10;
  //}
  }