Function prepend`Const`

prepend<T>(item: T): (src: Iterable) => Iterable
Prepends a single item ahead of all elements produced by the source iterable.

Curried version of _prepend.
Type Parameters
- T
  Element type produced by the source iterable.
Parameters
- item: T
  Element yielded before any value from the source iterable.
Returns (src: Iterable) => Iterable
A deferred iterable that first yields item and then every element from src.
Example
```
const values = [..._prepend([2, 3], 1)];
console.log(values); // [1, 2, 3]
```
or using the curried version:
```
const values = [
  ...pipeInto(
    [2, 3],
    prepend(1)
  ),
];
console.log(values); // [1, 2, 3]
```