Function allBlank

allBlank(texts?: (undefined | null | string)[]): boolean
Returns whether all the given texts are blank
Parameters
- Optionaltexts: (undefined | null | string)[]
  The texts to check
Returns boolean
whether all the given texts are blank
Author
David Hsing
Example
```
allBlank([null, undefined]);    // true
allBlank([null, 'true']);    // false
```