Function batchedForEach

batchedForEach<T>(
    arr: T[],
    batch_size: number,
    fn: (batch: T[], index: number) => Promise<void>,
): Promise<void>
Asynchronously iterate over an array in batches.
- If batch_size > 0, the array is split into consecutive batches of up to batch_size elements and processed sequentially.
- If batch_size === 0, the entire array is passed as a single batch (with index = 0).
Type Parameters
- T
Parameters
- arr: T[]
  The array to iterate over.
- batch_size: number
  Items per batch. 0 means "use the entire array as one batch". Must be a non-negative safe integer.
- fn: (batch: T[], index: number) => Promise<void>
  Async callback invoked for each batch.
  
  batch: A slice of arr (entire arr when batch_size === 0).
  
  index: Starting index of batch within arr (always 0 when batch_size === 0).
Returns Promise<void>
Resolves when all batches have been processed.
Throws
If batch_size is negative or not a safe integer.
Example
```
// Two-element batches
await batchedForEach([1,2,3,4,5], 2, async (batch, index) => {
  console.log(index, batch);
});
```
- Defined in function/batch.ts:29