What is Is_defined(), Is_null(), Is_Blank()?
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Answer / aditya
is_defined : Tests whether an expression results in a non-
NULL value.
Syn :long is_defined(expr)
is_null :Tests whether an expression results in a NULL
value.
Syntax : long is_null(expr)
is_blank : Tests whether a string contains only blank
characters.
Syntax : long is_blank(string str)
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