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Iterator: Reduce

Fold a list into a single value. The sub-graph runs once per element with el, index, and the running accumulator acc exposed by the auto-created Iterator::Entry. Each iteration's new accumulator is read from the auto-created Iterator::Collect.

Mirrors JavaScript's Array.prototype.reduce.

Example
Input array:    [1, 2, 3, 4]
Initial value:  0
Body:           acc + el
Output:         10

Parameters​

This function has no parameters.

Input​

Arrayrequired

List to fold over (Array or JSON array).

Initial

Optional starting value for the accumulator. When left unwired, the first array element seeds the accumulator and iteration starts at the second element (like JavaScript's reduce without an initial value); in that case an empty array fails with a MissingConnector error.

Output​

Result

The final accumulator value after all iterations.