Type alias TestFunction

TestFunction: ((v, i, x) => boolean)

Type declaration

- (v, i, x): boolean
- Handle selection of a substring (or character) in string.
  Parameters
  - v: string
    
    a substring (or character)
  - i: number
    
    index of substring in string
  - x: string
    
    string containing the substring
  Returns boolean
  whether it is selected

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