Variable declaration placement guidelines in VBScript
Is there any rule for placement of variable declaration in VBScript, like if it should always be declared in the beginning? Or can I declare the variable while using it? Which one is more efficient?
variables vbscript declaration placement
asked Nov 13 '18 at 8:42
Deepak ChhabriaDeepak Chhabria
61
add a comment |
Is there any rule for placement of variable declaration in VBScript, like if it should always be declared in the beginning? Or can I declare the variable while using it? Which one is more efficient?
variables vbscript declaration placement
asked Nov 13 '18 at 8:42
Deepak ChhabriaDeepak Chhabria
61
add a comment |
Is there any rule for placement of variable declaration in VBScript, like if it should always be declared in the beginning? Or can I declare the variable while using it? Which one is more efficient?
variables vbscript declaration placement
asked Nov 13 '18 at 8:42
Deepak ChhabriaDeepak Chhabria
61
Is there any rule for placement of variable declaration in VBScript, like if it should always be declared in the beginning? Or can I declare the variable while using it? Which one is more efficient?
variables vbscript declaration placement
variables vbscript declaration placement
asked Nov 13 '18 at 8:42
Deepak ChhabriaDeepak Chhabria
61
asked Nov 13 '18 at 8:42
Deepak ChhabriaDeepak Chhabria
61
asked Nov 13 '18 at 8:42
Deepak ChhabriaDeepak Chhabria
61
asked Nov 13 '18 at 8:42
Deepak ChhabriaDeepak Chhabria
61
asked Nov 13 '18 at 8:42
Deepak ChhabriaDeepak Chhabria
61
61
add a comment |
add a comment |
1 Answer
1
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Let's try with a simple code, with Option Explicit included so VBScript parser requests that all the variables used in the code are declared
Option Explicit
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
Dim data : data = 10
Const MY_DATA = 10
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
When executed it will ouptut
Empty
Integer
Integer
Integer
That is
The first access to
datadoes not generate any error. Variable declaration (theDimstatement) is hoisted. If the variable is declared inside the same (or outer) scope where it will be used then there will not be any problem.But the first output is
Empty. Only the declaration is hoisted, not the value assignment that is not executed until the line containing it is reached.That does not apply to constant declaration. Its value is replaced in code where it is used but the real declaration is delayed until the
constline is reached (read here).
As long as the variables/constants can be reached (they are declared in the same or outer scope) it is irrelevant (to the VBScript parser/engine) where you place the declaration.
But, of course, you or others will have to maintain the code. Being able to put the variables anywhere doesn't mean you should do something like the previous code (please, don't). It is a lot easier to read/maintain the code if variable declaration is done before initialization/usage. The exact way of doing it just depends on coding style.
answered Nov 13 '18 at 9:38
MC NDMC ND
58.5k54880
add a comment |
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1 Answer
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1 Answer
1
active
oldest
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votes
Let's try with a simple code, with Option Explicit included so VBScript parser requests that all the variables used in the code are declared
Option Explicit
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
Dim data : data = 10
Const MY_DATA = 10
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
When executed it will ouptut
Empty
Integer
Integer
Integer
That is
The first access to
datadoes not generate any error. Variable declaration (theDimstatement) is hoisted. If the variable is declared inside the same (or outer) scope where it will be used then there will not be any problem.But the first output is
Empty. Only the declaration is hoisted, not the value assignment that is not executed until the line containing it is reached.That does not apply to constant declaration. Its value is replaced in code where it is used but the real declaration is delayed until the
constline is reached (read here).
As long as the variables/constants can be reached (they are declared in the same or outer scope) it is irrelevant (to the VBScript parser/engine) where you place the declaration.
But, of course, you or others will have to maintain the code. Being able to put the variables anywhere doesn't mean you should do something like the previous code (please, don't). It is a lot easier to read/maintain the code if variable declaration is done before initialization/usage. The exact way of doing it just depends on coding style.
answered Nov 13 '18 at 9:38
MC NDMC ND
58.5k54880
add a comment |
Let's try with a simple code, with Option Explicit included so VBScript parser requests that all the variables used in the code are declared
Option Explicit
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
Dim data : data = 10
Const MY_DATA = 10
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
When executed it will ouptut
Empty
Integer
Integer
Integer
That is
The first access to
datadoes not generate any error. Variable declaration (theDimstatement) is hoisted. If the variable is declared inside the same (or outer) scope where it will be used then there will not be any problem.But the first output is
Empty. Only the declaration is hoisted, not the value assignment that is not executed until the line containing it is reached.That does not apply to constant declaration. Its value is replaced in code where it is used but the real declaration is delayed until the
constline is reached (read here).
As long as the variables/constants can be reached (they are declared in the same or outer scope) it is irrelevant (to the VBScript parser/engine) where you place the declaration.
But, of course, you or others will have to maintain the code. Being able to put the variables anywhere doesn't mean you should do something like the previous code (please, don't). It is a lot easier to read/maintain the code if variable declaration is done before initialization/usage. The exact way of doing it just depends on coding style.
answered Nov 13 '18 at 9:38
MC NDMC ND
58.5k54880
add a comment |
Let's try with a simple code, with Option Explicit included so VBScript parser requests that all the variables used in the code are declared
Option Explicit
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
Dim data : data = 10
Const MY_DATA = 10
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
When executed it will ouptut
Empty
Integer
Integer
Integer
That is
The first access to
datadoes not generate any error. Variable declaration (theDimstatement) is hoisted. If the variable is declared inside the same (or outer) scope where it will be used then there will not be any problem.But the first output is
Empty. Only the declaration is hoisted, not the value assignment that is not executed until the line containing it is reached.That does not apply to constant declaration. Its value is replaced in code where it is used but the real declaration is delayed until the
constline is reached (read here).
As long as the variables/constants can be reached (they are declared in the same or outer scope) it is irrelevant (to the VBScript parser/engine) where you place the declaration.
But, of course, you or others will have to maintain the code. Being able to put the variables anywhere doesn't mean you should do something like the previous code (please, don't). It is a lot easier to read/maintain the code if variable declaration is done before initialization/usage. The exact way of doing it just depends on coding style.
answered Nov 13 '18 at 9:38
MC NDMC ND
58.5k54880
Let's try with a simple code, with Option Explicit included so VBScript parser requests that all the variables used in the code are declared
Option Explicit
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
Dim data : data = 10
Const MY_DATA = 10
WScript.Echo TypeName( data )
WScript.Echo TypeName( MY_DATA )
When executed it will ouptut
Empty
Integer
Integer
Integer
That is
The first access to
datadoes not generate any error. Variable declaration (theDimstatement) is hoisted. If the variable is declared inside the same (or outer) scope where it will be used then there will not be any problem.But the first output is
Empty. Only the declaration is hoisted, not the value assignment that is not executed until the line containing it is reached.That does not apply to constant declaration. Its value is replaced in code where it is used but the real declaration is delayed until the
constline is reached (read here).
As long as the variables/constants can be reached (they are declared in the same or outer scope) it is irrelevant (to the VBScript parser/engine) where you place the declaration.
But, of course, you or others will have to maintain the code. Being able to put the variables anywhere doesn't mean you should do something like the previous code (please, don't). It is a lot easier to read/maintain the code if variable declaration is done before initialization/usage. The exact way of doing it just depends on coding style.
answered Nov 13 '18 at 9:38
MC NDMC ND
58.5k54880
edited Dec 30 '18 at 9:58
answered Nov 13 '18 at 9:38
MC NDMC ND
58.5k54880
answered Nov 13 '18 at 9:38
MC NDMC ND
58.5k54880
answered Nov 13 '18 at 9:38
MC NDMC ND
58.5k54880
58.5k54880
add a comment |
add a comment |
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