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Task/Null-object/Tcl/null-object-1.tcl
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Task/Null-object/Tcl/null-object-1.tcl
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if {$value eq ""} ...
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Task/Null-object/Tcl/null-object-2.tcl
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Task/Null-object/Tcl/null-object-2.tcl
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if {![info exist nullvar]} ...
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if {![info exists arr(nullval)]} ...
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if {![dict exists $dic nullval]} ...
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