Code Snippet for AccelStepper Oscillator

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//The code belongs to the following tutorial video: https://youtu.be/AR0un3kg-iM

/*
Please consider buying the parts using the following links in order to support my work:
Arduino UNO: https://www.banggood.com/custlink/33KKF85c3i
TB6600 Stepper Driver: https://www.banggood.com/custlink/KvvvZr1Pmj
Variable Power Supply: https://www.banggood.com/custlink/DGKvSpwFvQ
NEMA17: https://www.banggood.com/custlink/vGK3ic1tm2
*/
//This is a code snippet which can be added to the following PasteBin: https://pastebin.com/GF7ANksF
//It moves between 0 and 3000 step positions with 5000 step/s speed.
//It oscillates between 0 and 3000 until the user interrupts it.
//The code is blocking, so it can be stopped only after one of the 3000 steps are completed.


while(!Serial.available())
        {
        stepper.moveTo(3000); //Define a target position

        while(stepper.distanceToGo() != 0) //Move the motor until there are no steps left (this blocks the code)
        {
          stepper.runToPosition();
        }

        if(Serial.read() == 'n') break; //Dirty solution to break out from the while
        Serial.println(stepper.currentPosition()); //this should print 3000

        stepper.moveTo(0); //Define a target position

        while(stepper.distanceToGo() != 0) //Move the motor until there are no steps left (this blocks the code)
        {
          stepper.runToPosition();
        }
        Serial.println(stepper.currentPosition()); //This should print 0

        if(Serial.read() == 'n') break; //Dirty solution to break out from the while
        }

//Notes: This is an ugly code and it is only for some demonstration. It works, but it could be improved.
//The best practice would be to avoid the main while loop and let the Arduino code's loop() iterate.