There are a few different ways to analyze this data to determine when to buy or sell. I have set the default behavior for when we encounter the first time that the amount of highs or lows is greater than or equal to the length amount using a crossover or crossunder alert. You could also ignore the crossover or crossunder alerts and buy when the count is greater than or equal to the length, which can happen for extended periods depending on the underlying trend. Overall, buy when the buy label appears and sell when the sell label appears.
Let me know if there are any other custom indicators or scripts you would like to see me publish!
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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.