comments
Line comments. The compiler ignores them.
Reference/Language basics/Language
# comment // comment
Start a line or the rest of a line with # or //. A first line of # dovee (or // dovee) also marks the script as Dovee so Chart Script does not treat it as Pine.
Return value
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Example
# EMA cross strategy "EMA Cross" fast = ema(9) // 9-bar EMA of close when fast crosses above ema(21) buy