Logmanager documentation
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  1. Logmanager documentation
  2. /
  3. Additional informations
  4. /
  5. Events processing in blockly
  6. /
  7. Defined XML blocks
  8. /
  9. Logic blocks
  10. /
  11. Logic Null

Logic Null

Null is a spacial value representing empty set or empty value. May be returned by other blocks.

Null value can be tested only for equality and non equality. Not respecting this and testing None for example for greatness than any other value may result in catastrophic failure of processed code!

Block XML representation

XML representation of logic_null block

<xml xmlns="http://www.w3.org/1999/xhtml">
  <block type="logic_null"/>
</xml>

Example of visual representation

"null" Block

“null” Block

Example of block usage

Example of "null" block use

Example of “null” block use

In the example block null is used on the row “do in dictionary item” and it sets value null to the key “admin”.

Processing result

Result of "null" block use

Result of “null” block use