east Function – mapReduce

const mapReduce: <R, T>(
  calls?: 
  | string
  | number
  | DeferredCall<any>
  | ArrowFunction
  | LiveElement<ArrowFunction>[]
  | ReactElementInterop
  | LiveNode<any>[],
  map?: (t: T) => R,
  reduce?: (a: R, b: R) => R,
  then?: (r: R) => LiveElement,
  fallback?: NonNullable<R>,
  key?: Key,
) => DeferredCall<() => void>

Reduce values from a subtree, using the given map(...) and reduce(...).

Source

packages / live / src / builtin.ts