null

null -- a symbol that represents the presence of nothing.

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.

i1 : x = {2,3,,4}

o1 = {2, 3, , 4}

o1 : List
i2 : x#2
i3 : name x#2

o3 = null

o3 : String

See also Nothing.

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