The above question and the entire response thread below were originally posted in the Community Help track. On Wed Aug 7 18:53 UTC 2019, a member of the HCC moderation staff moved it to the Data Ingestion & Streaming track. The Community Help Track is intended for questions about using the HCC site itself.
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1) Pass your variable value with a null value.
2) The null value itself.
To find the difference between null and undefined, use the triple equality operator or Object is() method.
To loosely check if the variable is null, use a double equality operator(==). The double equality operator can not tell the difference between null and undefined, so it counts as same. So if you want to strict check, then don't use a double equality operator. It will lead to misconclusion.