FlowscopeDocs

T216

value cannot be reassigned

Open
View as Markdownllms.txt indexFull text for LLMs

Severity Error

An assignment targets a binding that is immutable: a let local, an input, a setup value, a data subscription or a function. Only state variables (and their fields and elements) can change after initialisation.

Declare the value as state if it has to change between bars, or introduce a new let with a different name for a derived value.

Failing example

Flowscope Script
script "Adaptive threshold"
data (
  chart = subscribe(data.ohlcv)
  liq = subscribe(data.liquidations)
)
setup threshold = 1_000_000.0
plot hit = plot.marker(title: "Liq above threshold", shape: shape.diamond)
on chart.close {
  let total = liq.total ?? 0.0
  if total > threshold {
    hit.plot(chart.high)
    threshold *= 1.1
  }
}

Fixed example

Flowscope Script
script "Adaptive threshold"
data (
  chart = subscribe(data.ohlcv)
  liq = subscribe(data.liquidations)
)
state threshold: float = 1_000_000.0
plot hit = plot.marker(title: "Liq above threshold", shape: shape.diamond)
on chart.close {
  let total = liq.total ?? 0.0
  if total > threshold {
    hit.plot(chart.high)
    threshold *= 1.1
  }
}