Guessing game - OpenProcessing

mySketch
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function setup() {
  createCanvas(windowWidth, windowHeight);
  background(100);
  
  buttonLEFT = createButton('LEFT');
  buttonLEFT.position(20, 20);
  buttonLEFT.mousePressed(leftButton);
  
  buttonRIGHT = createButton('RIGHT');
  buttonRIGHT.position(120, 20);
  buttonRIGHT.mousePressed(rightButton);
  
}
​
let counts = {};
let running_str = "";
let last_input = 0;
let curr_input = 0;
let acc = 0;
let total = 0;
let history_size = 3;
​
function draw() {
  if (last_input == "LEFT")
    curr_input = "0";
​
  if (last_input == "RIGHT")
    curr_input = "1";
  
  let size = running_str.length;
  let display_pred;
  let display_color = color(0, 255, 0);
  
  if ((size >= history_size) && (last_input != 0)) {
    last_batch = running_str.slice(size-history_size, size);
    
    if (last_batch in counts) {
      let zeros_count = counts[last_batch][0];
      let ones_count = counts[last_batch][1];
      
      if (zeros_count > ones_count) {
        display_pred = "Predicted: LEFT";
​
        if (last_input == "LEFT")
          acc += 1;
        else
          display_color = color(255, 0, 0);
      }
​
      else if (zeros_count < ones_count) {
        display_pred = "Predicted: RIGHT";
​
        if (last_input == "RIGHT")
          acc += 1;
        else
          display_color = color(255, 0, 0);
      }
      
      else {
        let pred = Math.floor(Math.random()*2);
        if (pred == 0) {
          display_pred = "Predicted: LEFT";
​
          if (last_input == "LEFT")
            acc += 1;
          else
            display_color = color(255, 0, 0);
        }
        else {
          display_pred = "Predicted: RIGHT";
​
          if (last_input == "RIGHT")
            acc += 1;
          else
            display_color = color(255, 0, 0);
        }
      }
        
      counts[last_batch][Number(curr_input)] += 1;
    }
      
    else // if no such key yet
    {
      let pred = Math.floor(Math.random()*2);
        if (pred == 0) {
          display_pred = "Predicted: LEFT";
​
          if (last_input == "LEFT")
            acc += 1;
          else
            display_color = color(255, 0, 0);
        }
        else {
          display_pred = "Predicted: RIGHT";
​
          if (last_input == "RIGHT")
            acc += 1;
          else
            display_color = color(255, 0, 0);
        }
      counts[last_batch] = [0, 0];
    }
      
    total += 1;
​
    textSize(width/20);
    background(100);
    
    fill(255);
​
    let normed_accuracy = round(acc/total * 10000) / 10000
    text("Accuracy: " + normed_accuracy, width/13.66, height/2.15+height/10);
    text("You pressed: " + last_input, width/13.66, height/6.45+height/10);
    
    fill(display_color);
    text(display_pred, width/13.66, height/3.225+height/10);
  }
  
  if (size < history_size) {
      background(100);
      fill(255);
      textSize(width/35);
      text("Start pressing LEFT and RIGHT arrows.\nThe program tries to predict what you will press.", 50, height/3.225);
      text("For any combination of three keys\nthe program tracks your most common fourth key pressed.", 50, height/2.15);
    
  }
  
  if ((last_input == "LEFT") || (last_input == "RIGHT"))
  {
    running_str += curr_input;
    last_input = 0;
  }
​
}
​
function keyPressed() {
  if (keyCode == LEFT_ARROW)
    {
      last_input = "LEFT";
    }
​
  if (keyCode == RIGHT_ARROW)
  {
    last_input = "RIGHT";
  }
}
​
function leftButton() {
  last_input = "LEFT";
}
​
function rightButton() {
  last_input = "RIGHT";
}