Us, coders would like to do this: `highest(series,barssince(...))`
But it is not working.
Numerous coders are using RicardoSantos' f_highest/f_lowest script (www.tradingview.com/...tion-Highest-Lowest/), probably the most often copy/pasted snippet of PineScript code out there. It is doing more-less what `highest(series,barssince(...))` would be doing, but with hardcoded max bars back.
Ricardo is my idol by the way, but that didn't stop me from creating my own version of Highest/Lowest functions. They are fast, simple, effective and very light for Pine engine.
Please treat this as an OPEN SOURCE snippet of code, which can be used in variety of ways.
I have implemented a simple use-case myself, to demonstrate what can be done. The example shows what was the highest/lowest value of RSI since the previous cross of Stochastic. So that you don't enter SHORT on Stochastic crossunder, if RSI didn't reach oversold (<30) since the previous Stochastic crossunder = aka maybe the downtrend has exhausted.
I'm sure you'll find plenty of use cases for it in your studies and strategies as well. If you create your own code using my Highest/Lowest functions, don't hesitate to put a link down here in comments.
P.S. This is not a strategy in any way, so don't ask me "does it backtest well?".
P.S.2 This code doesn't repaint as well ;)
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.