That's the first time I've heard this. Do you have any evidence to back this up?
To my mind the distinction between the two is quite clear:
undefined: no value has yet been assigned
null: explicitly set to empty
In practice I agree they're interchangeable, but occasionally it's useful to be able to distinguish between a value that hasn't been set and one that has been explicitly emptied.
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That's the first time I've heard this. Do you have any evidence to back this up?
To my mind the distinction between the two is quite clear:
undefined: no value has yet been assignednull: explicitly set to emptyIn practice I agree they're interchangeable, but occasionally it's useful to be able to distinguish between a value that hasn't been set and one that has been explicitly emptied.