Function flatten

flatten<T>(iterables: Iterable<Iterable<T, any, any>>): Generator<T, void, any>
Creates a generator that flattens an iterable of iterables into a single sequence. Similar to Array.prototype.flat() with depth 1, but works with any iterable.
Type Parameters
- T
  Type of elements in the inner iterables
Parameters
- iterables: Iterable<Iterable<T, any, any>>
  An iterable of iterables to flatten
Returns Generator<T, void, any>
A generator that yields all elements from the nested iterables
Yields
Elements from each nested iterable in sequence
Example
```
import * as G from '@prelude/generator'

// Flatten arrays
const result = G.pipe(
  G.flatten([[1, 2], [3, 4], [5, 6]]),
  G.array
)
// Result: [1, 2, 3, 4, 5, 6]
```
Example
```
import * as G from '@prelude/generator'

// Flatten different iterable types
const result = G.pipe(
  G.flatten([new Set([1, 2]), [3, 4], "56"]),
  G.array
)
// Result: [1, 2, 3, 4, '5', '6']
```
Example
```
import * as G from '@prelude/generator'

// Empty iterables are skipped
const result = G.pipe(
  G.flatten([[1, 2], [], [3, 4]]),
  G.array
)
// Result: [1, 2, 3, 4]
```
See
flatMap - For mapping and flattening in one operation
- Defined in generator/src/flatten.ts:49