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It can be used on a type to control nullability, it is then called the null forgiving operator In the past null was in the global scope so using it slowed execution and led me to prefer other falsy types (false, '',. Operator to the value null
This overrides the nullability of. And function return values default to undefined And then == null does a perfect job, because it covers exactly those 2 values
== null is equivalent to === null && === undefined) in exceptional cases you do want a clear distinction.
The reasoning is that a null means unknown, so the result of any comparison to a null is also unknown So you'll get no hit on rows by coding where my_column = null Comparing null with anything yields a null Null is part of trinary logic
There are many people who think that the concept of the special value null (as it is used in lanuages like c, java, c#, perl, javascript, sql etc.) is a bad idea 135 null has no value, and so cannot be compared using the scalar value operators In other words, no value can ever be equal to (or not equal to) null because null. In order to be able to query this difference, javascript has null and undefined
It was the invention of the null reference in 1965
At that time, i was designing the first comprehensive. What are null pointer exceptions (java.lang.nullpointerexception) and what causes them What methods/tools can be used to determine the cause so that you stop the exception from causing.
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