figuring out a script functionality here

[imoree]

Let ( [

~isSameFIeld = "firstName" ;

[color=#ff0000][b][i]~isSameField = $$SORT.FIELD = ~field ; $$SORT.FIELD = ~field //THIS HAS ME BAFFLED?[/i][/b][/color]

];



~isSameField )

I JUST dont understand the mult-equals for all those variables?

anyone ?

-i

[David Jondreau]

The equals sign "=" servers two purposes in a calculation engine. Firstly, it's a comparison test. The expression 2+2 = 4 returns 1 ( True ). 2+2 = 5 returns 0 ( False ). Secondly, within a Let() statement, it's an assignment operator. It permits you to define a variable. Let([ x = 3 ; result = x + 2 ]; result ) returns 5.

There's an error in that calculation, I'm guessing the first ~isSameField should actually be ~field. And on top of that, it's unclear what the calc is supposed to do, set the sort field variable and return if it's been changed? One thing that happening is there's a test to see if the ~field is the same as the $$SORT.FIELD = $$SORT.FIELD = ~field . The result of that test is being stored in the variable ~isSameField.

~isSameField = $$SORT.FIELD = ~field

could be made clearer by adding parens:

~isSameField = ( $$SORT.FIELD = ~field )

Let ( [

//define the local variable ~field

~field = "firstName" ;

//check to see if the global variable SORT.FIELD is the same as the local ~field

~isSameField = $$SORT.FIELD = ~field ;

//redefine the global variable SORT.FIELD

$$SORT.FIELD = ~field

];

//return the result of the test...has $$SORT.FIELD been redefined or not?

~isSameField

)

[imoree]

thanks, so it works like a toggle on / off?

-i

[David Jondreau]

What the equals sign or the calculation?

[imoree]

Let ( [ 

~field = "firstName" ; 

~isSameField = $$SORT.FIELD = ~field ; 

$$SORT.FIELD = ~field ]; 



~isSameField )

let ~field = "firstName" => set ~field to be equal to firstName [database field name]

let ~isSameField = $$SORT.FIELD = ~field; ( set ~isSameField = global $$SORT.FIELD then it is = ~field

set $$SORT.FIELD to be same as ~field ;

return the !~isSameField variable

i hope that is what it does. the second line is a shortcut for if, or case ; no?

[comment]

let ~field = "firstName" => set ~field to be equal to firstName [database field name]

Not really. "firstName" (in quotes) is a literal text string, not a reference to a field.

[imoree]

Not really. "firstName" (in quotes) is a literal text string, not a reference to a field.

yes that is true - thanks again.