Function isTypeof

isTypeof(array?, type?, relaxed?): boolean
Returns whether each element in the given array is the expected type
Parameters
- Optionalarray: null | any[] | readonly any[]
  the array to check
- Optionaltype: string
  the expected element type
- relaxed: boolean = false
  treat null as string or object
Returns boolean
whether each element in the given array is the expected type
Example
```
isTypeof(['foo', 'bar'], 'string');    // true
isTypeof(['foo', 'bar', null], 'string', true);    // true
```