Function prepend

prepend<T>(x): (<U>(list) => (T | U)[])
Adds a new item to the start of an array, or returns a new array if list is null or undefined.

Same as [x, ...list].
Type Parameters
- T
Parameters
- x: T
Returns (<U>(list) => (T | U)[])
- - <U>(list): (T | U)[]
  - Type Parameters
    - U
    Parameters
    - list: U[]
    Returns (T | U)[]
Example
```
prepend(0)([3, 6, 9])
// => [0, 3, 6, 9]

prepend(0)(undefined)
// => [0]
```
- Defined in lib/fns/array.ts:212

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