Function reduce

reduce<T>(str: string, fn: ((prev: T, char: string, index: number, chars: string[]) => T), initialValue?: T): T
Just like array.reduce

Example
```
reduce('123', (prev, char) => prev + (+char), 0); // 6
```
Type Parameters
- T = any
Parameters
- str: string
- fn: ((prev: T, char: string, index: number, chars: string[]) => T)
  - - (prev: T, char: string, index: number, chars: string[]): T
    - Parameters
      
      prev: T
      
      char: string
      
      index: number
      
      chars: string[]
      
      Returns T
- initialValue: T = ...
Returns T
- Defined in string/reduce/index.ts:9

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