Function isFalse

isFalse(value?): boolean
Returns whether the given value can be converted to false
Parameters
- Optionalvalue:
      | null
      | string
      | number
      | boolean
      | (() => boolean)
  the source value to check
Returns boolean
whether the given value can be converted to false
Example
```
isFalse(false);    // true
isFalse(0);    // true
isFalse('false');    // true
isFalse('no');    // true
isFalse('foobar');    // false
isFalse(() => false);    // true
```