Function join

join(fallback): ((separator) => (<T>(list) => string))
Joins items in an array using separator, or returns the fallback if list is null or undefined.
Parameters
- fallback: string
Returns ((separator) => (<T>(list) => string))
- - (separator): (<T>(list) => string)
  - Parameters
    - separator: string
    Returns (<T>(list) => string)
    - - <T>(list): string
      - Type Parameters
        
        T
        
        Parameters
        
        list: T[]
        
        Returns string
Example
```
join('fallback')(',')([3, 6, 9])
// => "3,6,9"

join('fallback')(',')(undefined)
// => "fallback"
```
- Defined in lib/fns/array.ts:161

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