Enum Reducer 

pub enum Reducer {
    Overwrite,
    Append,
    Sum,
    Custom(Arc<dyn Fn(Value, Value) -> Value + Send + Sync>),
}

Available on crate feature graph only.

Reducer determines how state updates are merged

Variants

Overwrite

Replace the value entirely (default)

Append

Append to a list

Sum

Sum numeric values

Custom(Arc<dyn Fn(Value, Value) -> Value + Send + Sync>)

Custom merge function

Trait Implementations

impl Clone for Reducer

fn clone(&self) -> Reducer

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Reducer

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for Reducer

fn default() -> Reducer

Returns the “default value” for a type.