src/Observable.php
public function startWith($startValue, SchedulerInterface $scheduler = null): Observable
    {
        return $this->startWithArray([$startValue], $scheduler);
    }
public function startWith($startValue, SchedulerInterface $scheduler = null): Observable
    {
        return $this->startWithArray([$startValue], $scheduler);
    }
public function startWith ( $ startValue , SchedulerInterface $ scheduler = null ) : Observable { return $ this -> startWithArray ( [ $ startValue ] , $ scheduler ) ; }
Prepends a value to an observable sequence with an argument of a signal value to prepend.

@param mixed $startValue
@param SchedulerInterface $scheduler
@return Observable

@demo startWith/startWith.php
@operator
@reactivex startwith
Prepends a value to an observable sequence with an argument of a signal value to prepend .