LDC2 + Emscripten + SDL + std.algorithms's sort & map

sdl.d

// this is modified example
// original is from: http://d.hatena.ne.jp/ABA/20130331#p1
import SDL;
import SDL_video;
import std.stdio;
import std.algorithm;

immutable width = 640, height = 480;
SDL_Surface *screen;
int ticks = 0;

void update() {
  SDL_LockSurface(screen);
  for (int i = 0; i < height; i++) {
        for (int j = 0; j < width; j++) {
            *(cast(char*)screen.pixels + i*width*4 + j*4 + 0) = cast(char)(j + ticks) % 128;
            *(cast(char*)screen.pixels + i*width*4 + j*4 + 1) = cast(char)(i + ticks) % 128;
            *(cast(char*)screen.pixels + i*width*4 + j*4 + 2) = cast(char)((255-i) + ticks) % 128;
    }
  }
  SDL_UnlockSurface(screen);
  SDL_Flip(screen);
  ticks++;
}

extern(C):
void mainLoop() {
  update();
}

void emscripten_set_main_loop(void function(), int fps, int simulate_infinite_loop);

int main() {
  auto arr = [10, 11, 12]; // this needed some additions to emscripten's library.js (_d_newarrayT/_d_newarrayvT)
  auto sr = sort(arr).map!(a => a * a)();

  foreach (i; sr)
    printf("i: %d\n", i); // writeln() and friends are currently broken

  SDL_Init(SDL_INIT_VIDEO);
  screen = SDL_SetVideoMode(width, height, 32, SDL_SWSURFACE);
  emscripten_set_main_loop(&mainLoop, 60, 1);
  return 0;
}