Difference between revisions of "Eval"
clarified
imported>Odessa (Created) |
imported>Odessa (clarified) |
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{{Function | {{Function | ||
|origin = NVSE | |origin = NVSE | ||
|summary = Added by NVSE V4. Reduces an expression to a boolean for use in conditional statements. Used to permit the usage of any function or expression that may be so reduced. | |summary = Added by NVSE V4. Reduces an expression to a boolean for use in conditional statements. Used to permit the usage of any function or expression that may be so reduced for a conditional, when the compiler would otherwise disallow it. | ||
Eval is required to test the value of [[User Defined Function|user defined functions]], and those related to [[Array Variables|arrays]] and [[String Variables|strings]] in conditionals. | Eval is required to test the value of [[User Defined Function|user defined functions]], and those related to [[Array Variables|arrays]] and [[String Variables|strings]] in conditionals. | ||
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let aBeatles := ar_List JohnREF, PaulREF, GeorgeREF, RingoREF | let aBeatles := ar_List JohnREF, PaulREF, GeorgeREF, RingoREF | ||
if eval (aBeatles[3] == RingoREF) | if eval (aBeatles[3] == RingoREF) ; * test the fourth element of array is Ringo | ||
; Do something | ; Do something | ||
endif | endif | ||
if eval (Ar_Size aBeatles > 0) | if eval (Ar_Size aBeatles > 0) ; * test array holds more than zero elements | ||
; Do something | ; Do something | ||
endif | endif | ||
if eval (Call SomeSuitableUDF) | if eval (Call SomeSuitableUDF) ; * test the user defined function returns true | ||
; Do something | ; Do something | ||
endif | endif | ||