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scan

graphrefly_operators::transform

Function scan 

Source 
pub fn scan<F>(
    core: &Core,
    binding: &Arc<dyn OperatorBinding>,
    source: NodeId,
    fold: F,
    seed: HandleId,
) -> OperatorRegistration
where
    F: Fn(HandleId, HandleId) -> HandleId + Send + Sync + 'static,
Expand description

scan(source, fold, seed) — left-fold emitting each new accumulator.

Required seed: there is no seedless mode where the first value becomes the accumulator (matches TS legacy). The seed handle must be pre-registered by the caller with the binding (so it has a real HandleId). Core takes one retain on the seed for the ScanState slot’s lifetime.