8 functions with button WITH debounce

LED_strips.ino

#include <SPI.h>
#include <Adafruit_DotStar.h>
#include "FastLED.h"

#define NUM_LEDS 15
#define BRIGHTNESS 96
#define FRAMES_PER_SECOND  120

#define DATA_PIN 5
#define CLOCK_PIN 6

CRGB leds[NUM_LEDS];

int buttonPin = 2;
int val, val2;
int buttonState;
int lastButtonState = LOW;
int counter;

long lastDebounceTime = 0;
long debounceDelay = 50;

void setup() {
  pinMode(buttonPin, INPUT);
  buttonState = digitalRead(buttonPin);

  Serial.begin(9600);
  LEDS.addLeds<DOTSTAR, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS);
  LEDS.setBrightness(BRIGHTNESS);
}

void loop() {
  int reading = digitalRead(buttonPin);
  
  if (reading != lastButtonState) {
    // reset timer
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      counter++;
    }
  }
  
  switch (counter) {
    case 1:
      oneSprinkle();
      break;
    case 2:
      threeSprinkle();
    case 3:
      fadeHue();
      break;
    case 4:
      fadeNoBounce();
    case 5:
      fadeBounce();
      break;
    case 6:
      fadeHalfHue();
      break;
    case 7:
      bounceFadeRain();
      break;
    case 8:
      tropicThunder();
      break
  }
  
  lastButtonState = reading;

}

void oneSprinkle() {
  static uint8_t hue = 0;
  for (int i = 0; i <= NUM_LEDS; i++) {
    leds[i] = CHSV(255, 255, 255);
  }
  FastLED.show();
  delay(10);
}

void threeSprinkle() {
  static uint8_t hue = 0;
  // forth
  for (int i = 0; i <= NUM_LEDS; i++) {
    leds[i + 0] = CHSV(255, 255, (255 / 10) * 1);
    leds[i + 1] = CHSV(255, 255, (255 / 10) * 2);
    leds[i + 2] = CHSV(255, 255, (255 / 10) * 5);
    leds[i + 3] = CHSV(255, 255, (255 / 10) * 10);
    FastLED.show();
    leds[i] = CRGB::Black;
    delay(100);
  }
}

void fadeHue() {
  FastLED.show();
  FastLED.delay(1000 / FRAMES_PER_SECOND);
  EVERY_N_MILLISECONDS( 20 ) {
    gHue++;
  }
}

void fadeNoBounce() {
  static uint8_t hue = 0;
  // forth
  for (int i = 0; i <= NUM_LEDS; i++) {
    leds[i + 0] = CHSV(255, 255, (255 / 10) * 1);
    leds[i + 1] = CHSV(255, 255, (255 / 10) * 2);
    leds[i + 2] = CHSV(255, 255, (255 / 10) * 5);
    leds[i + 3] = CHSV(255, 255, (255 / 10) * 7);
    leds[i + 4] = CHSV(255, 255, (255 / 10) * 10);
    FastLED.show();
    leds[i] = CRGB::Black;
    delay(100);
  }
}

void fadeBounce() {
  static uint8_t hue = 0;
  // forth
  //  for (int i = 0; i <= NUM_LEDS; i++) {
  //    leds[i + 0] = CHSV(255, 255, (255 / 10) * 1);
  //    leds[i + 1] = CHSV(255, 255, (255 / 10) * 2);
  //    leds[i + 2] = CHSV(255, 255, (255 / 10) * 5);
  //    leds[i + 3] = CHSV(255, 255, (255 / 10) * 7);
  //    leds[i + 4] = CHSV(255, 255, (255 / 10) * 10);
  //    FastLED.show();
  //    leds[i] = CRGB::Black;
  //    delay(100);
  //  }
  //and back
  for (int i = (NUM_LEDS / 2); i >= 0; i--) {
    leds[i] = CHSV(255, 255, (255 / 10) * 10);
    leds[i] = CHSV(255, 255, (255 / 4) * 3);
    leds[i] = CHSV(255, 255, (255 / 4) * 2);
    leds[i] = CHSV(255, 255, (255 / 4) * 1);
    leds[i] = CHSV(255, 255, (255 / 4) * 0.5);
    FastLED.show();
    leds[i] = CRGB::Black;
    delay(100);
  }
}

void fadeHalfHue() {
  fadeToBlackBy( leds, NUM_LEDS, 20);
  int pos = beatsin16(8, 0, NUM_LEDS);
  leds[pos] += CHSV(gHue, 200, 192);
  if (pos >= 7) {
    gHue = 250;
  } else {
    gHue = 50;
  }
}

void bounceFadeRain() {
  fadeToBlackBy(leds, NUM_LEDS, 20);
  int pos = beatsin8(10, 0, NUM_LEDS);
  leds[pos] += CHSV(gHue, 255, 192);
  if (pos == 1 || pos == 15) {
    hit++;
  }
  FastLED.show();
  FastLED.delay(100 / FRAMES_PER_SECOND);
  if (hit % 4 == 0) {
    gHue++;
  }
}

void tropicThunder() {
  // adapted from Michael's Unicorn Thunder
  //  https://github.com/mixania/Unicorn
  //  ☆彡 ☆。、:*:。
  unsigned int randSpark = random(0, (NUM_LEDS) - 1);
  unsigned int thunderDelay = random(3, 50);
  leds[randSpark] = CRGB::Turquoise;
  FastLED.show();
  delay(thunderDelay);
  leds[randSpark] = CRGB::Orange;
  FastLED.show();
  delay(thunderDelay);
  leds[randSpark] = CRGB::HotPink;
  FastLED.show();
  delay(thunderDelay);
  leds[randSpark] = CRGB::Black;
  delay(thunderDelay);
}

Thanks for this! However, I get an error on line 69 that says expected ';' before '}' token.