klemola

export function isNotAsked<T, E>(
  remoteData: RemoteData<T, E>
): remoteData is NotAsked {
  return remoteData.type === "NotAsked";
}

export function isLoading<T, E>(
  remoteData: RemoteData<T, E>
): remoteData is Loading {
  return remoteData.type === "Loading";

klemola

function render(
  userRequest: RemoteData<User, Error>,
  translationsRequest: RemoteData<Translations, Error>
) {
  if (isLoading(userRequest) || isLoading(translationsRequest)) {
    return "Loading...";
  } else if (isSuccess(userRequest) && isSuccess(translationsRequest)) {
    const { username } = userRequest.data;
    const { greeting } = translationsRequest.data;
    return `${greeting}, ${username}`;

klemola

interface Initializing {
  type: "Initializing";
}

interface Ready {
  type: "Ready";
  user: User;
  translations: Translations;
}

klemola

function render(appState: AppState) {
  switch (appState.type) {
    case "Initializing":
      return "Loading...";

    case "Ready":
      const { username } = appState.user;
      const { greeting } = appState.translations;
      return `${greeting}, ${username}`;

klemola

export function main() {
  let userRequest: RemoteData<User, Error> = Loading;
  let translationsRequest: RemoteData<Translations, Error> = Loading;
  let appState: AppState = Initializing;

  fetchUser()
    .then(response => {
      userRequest = Success(response);

      if (isSuccess(userRequest) && isSuccess(translationsRequest)) {

klemola

fn update_gravity_visuals(
    mut visuals_query: Query<(&mut Path, &mut DrawMode, &mut GravityRing)>,
    gravity_source: Res<GravitySource>,
) {
    let level_bounds_radius_pixels = LEVEL_BOUNDS_RADIUS_METERS * PIXELS_PER_METER;
    let gravity_source_radius_pixels = GRAVITY_SOURCE_RADIUS_METERS * PIXELS_PER_METER;
    let min_radius = gravity_source_radius_pixels;
    // fade to nothing just before the ring hits the terrain
    let max_radius = level_bounds_radius_pixels;