< > BotCompany Repo | #1024376 // rWatcher - wrap a Runnable & only run it if a value has changed. executes the first time

JavaX fragment (include) [tags: use-pretranspiled]

Libraryless. Click here for Pure Java version (1642L/11K).

static <A> Runnable rWatcher(IF0<A> calc, Runnable r) {
  ret new Runnable {
    A value;
    
    run {
      A newValue = callF(calc);
      if (neq(value, newValue)) {
        value = newValue;
        callF(r);
      }
    }
  };
}

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