createCanvas(400, 400);

}

​

function draw() {

  background(50);

​

  let result = checkMouseX(100, 300);

  if (result == true) {

    rect(100, 0, 200, 400);

  }

}

​

function checkMouseX(min, max) {

  let value;

  if (mouseX >= min && mouseX <= max) {

    value = true;

  } else {

    value = false;

  }

  return value;

}

​