Function elemOfStrIn

elemOfStrIn(haystack): ((needle) => Opt<boolean>)
Checks if the string value inside this Opt is a substring of the given string.
Parameters
- haystack: string
  The string to search in
Returns ((needle) => Opt<boolean>)
A function that takes an Opt and returns an Opt
- - (needle): Opt<boolean>
  - Parameters
    - needle: Opt<string>
    Returns Opt<boolean>
Example
```
elemOfStrIn('abc')(opt('a')) // Some(true)
elemOfStrIn('abc')(opt('d')) // Some(false)
elemOfStrIn('abc')(none) // None
```
See
Opt.elemOfStrIn
- Defined in Opt.ts:2559

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