Function allTrue

allTrue(values?: (undefined | null | string | number | boolean)[]): boolean
Returns whether all the given elements are true
Parameters
- Optionalvalues: (undefined | null | string | number | boolean)[]
  the elements to check
Returns boolean
whether all the given elements are true
Author
David Hsing
Example
```
allTrue([null, undefined]);    // false
allTrue([null, true]);    // false
allTrue([true, true]);    // true
```