< > BotCompany Repo | #1027607 // rWatcher_noRunFirstTime - wrap a Runnable & only run it if a value has changed

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

Libraryless. Click here for Pure Java version (2209L/14K).

static <A> Runnable rWatcher_noRunFirstTime(IF0<A> calc, Runnable r) {
  ret rWatcher_noRunFirstTime(calc, runnableToIVF1(r));
}

static <A> Runnable rWatcher_noRunFirstTime(IF0<A> calc, IVF1<A> r) {
  ret new Runnable {
    A value = callF(calc);
    
    run {
      A newValue = callF(calc);
      if (neq(value, newValue)) {
        value = newValue;
        callF(r, value);
      }
    }
  };
}

Author comment

Began life as a copy of #1024376

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