Function compose4

compose4<R4>(fallback): (<T, R1, R2, R3>(fns) => ((x) => R4))
Compose an array of exactly 4 functions from bottom to top (right to left).

Returns the fallback if x is null or undefined.
Type Parameters
- R4
Parameters
- fallback: R4
Returns (<T, R1, R2, R3>(fns) => ((x) => R4))
- - <T, R1, R2, R3>(fns): ((x) => R4)
  - Type Parameters
    - T
    - R1
    - R2
    - R3
    Parameters
    - fns: [Unary<R3, R4>, Unary<R2, R3>, Unary<R1, R2>, Unary<T, R1>]
    Returns ((x) => R4)
    - - (x): R4
      - Parameters
        
        x: T
        
        Returns R4
See
compose2, compose3

Example
```
compose4('fallback')([w => w.join('/'), z => [z, z], y => y.toString(), x => x / 2])(42)
// => "21/21"

compose4('fallback')([w => w.join('/'), z => [z, z], y => y.toString(), x => x / 2])(undefined)
// => "fallback"
```
- Defined in lib/fns/compose.ts:74

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