Function optional

optional<T>(val, map): false | Dict<T>
Function to be used to construct an update object. If value is null or undefined - property will not be updated. Example:
```
   await update('table_name',
     {
       title: element.title,
       ...optional(element.description, val => ({ description: val })),
     },
     { id: elementId },
   ).run(ctx);
```
Type Parameters
- T
Parameters
- val: T
  
  value to be used to update a property
- map: ((val) => Dict<T>)
  
  mapping function that will return an update object for the property
  - - (val): Dict<T>
    - Parameters
      
      val: T
      
      Returns Dict<T>
Returns false | Dict<T>

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