Description
When it is the value of an expression entered into the interpreter, the output line doesn't appear. Empty spots in a list are represented by it.
It is the only member of the class
Nothing, which strictly speaking, ought to have no members at all.
An
if expression with no
else clause returns
null when the predicate is false.
Various routines that prepare data for printing convert
null to an empty string.
i1 : x = {2,3,,4}
o1 = {2, 3, , 4}
o1 : List
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i2 : net x
o2 = {2, 3, , 4}
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i3 : toString x#2
o3 = null
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i4 : peek x
o4 = {2, 3, null, 4}
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