Function isFilledString

isFilledString(str: string): boolean
Returns true if the string contains at least one non-whitespace character.
Parameters
- str: string
  The input string.
Returns boolean
Example
```
isFilledString("hello") // => true
isFilledString("   ")   // => false
isFilledString("")      // => false
```
- Defined in string/isFilledString/index.ts:13