Learning Understanding ta.change

//First script I have published. Constructive criticism is welcome.
// I hope this may be helpful to you.

// Initially, I did this for myself as I was getting some odd results from the ta.change function. Turns out it was my error LOL. What a surprise!

// Typical syntax: ta.change(source, value)
// value doesn't need to be included. If it isn't, it will only calculate the change between the last and current value.

// Conclusion. ta.change simply calculates the difference between a previous value/candle and the latest value/candle current value in that series. Positive number states that the recent is higher.

// Bonus :-) Function on line 34 outputs the changes in a positive figure (so as to be able to sum the changes/volatility of the series of values)