query: I can not understand, when the left operand of ?? becomes null in below code?
positive_passages.docid: 87305
positive_passages.text: What do two question marks together mean in C#?
negative_passages.docid: 72088
negative_passages.text: Why shouldn't we allow NULLs?
negative_passages.docid: 57267
negative_passages.text: Short circuit behavior of logical expressions in C in this example
negative_passages.docid: 15435
negative_passages.text: how to check if $1 and $2 are null?
negative_passages.docid: 154567
negative_passages.text: difference between null != something and something != null
negative_passages.docid: 15097
negative_passages.text: Is there any difference between IS NULL and =NULL
negative_passages.docid: 129515
negative_passages.text: Error : Operand for operator "++" must be an lvalue
negative_passages.docid: 5975
negative_passages.text: How to avoid returning a Null if there is no "else" condition in an If construct
negative_passages.docid: 50416
negative_passages.text: What does the >?= operator mean?
negative_passages.docid: 128255
negative_passages.text: Empty Strings: Why or when is '' equal to ' '?
negative_passages.docid: 155408
negative_passages.text: What's the function of the "|" (pipe) operator?
negative_passages.docid: 99447
negative_passages.text: What is the difference between String? and String! (two ways of creating an optional variable)?
negative_passages.docid: 44243
negative_passages.text: Question on operator: // N
negative_passages.docid: 86355
negative_passages.text: ?: ternary conditional operator behaviour when leaving one expression empty
negative_passages.docid: 67917
negative_passages.text: what does $('') do?
negative_passages.docid: 146668
negative_passages.text: What does square bracket [] mean in the below code?
negative_passages.docid: 117240
negative_passages.text: What does this error in an equation mean !missing} inserted