Let scope

[#1]

I have a loop in my script, something like below:

For i = 0 TO 10

    LET expr = i * 2;

NEXT i

I would like to know whether expr variable created within loop is available outside loop for, for example, could I do something like below?

or I need to declare variable expr before loop for using SET sentence?

For i = 0 TO 10

    LET expr = i * 2;

NEXT i

LET another_expr = expr;  // What is the value for expr here? 20?

[Anil_Babu_Samineni]

Might be from 0 to 9 The values are not correct. That's why the loop working on 10th Value

10 * 2 = 20

[jpenuliar · Accepted solution]

Hi Tony TP,

variable expr is not private to the for loop.

That's why, you can perform transferring value of expr to another_expr.

which is 20 at the end of For Next.

Its interesting to run the loop in debug to follow the iterations.

regards,

jp

[Clever_Anjos]

Qlikview variables are always global scope.

in your case, last value for expr = 10 * 2 = 20

[maxgro]

try this, I added some trace to your "for loop"

For i = 0 TO 10

    LET expr = i * 2;

    trace i=$(i) expr=$(expr);

NEXT i

LET another_expr = expr;  

trace another_expr=$(another_expr);

and you get this result

i=0 expr=0

i=1 expr=2

i=2 expr=4

i=3 expr=6

i=4 expr=8

i=5 expr=10

i=6 expr=12

i=7 expr=14

i=8 expr=16

i=9 expr=18

i=10 expr=20

another_expr=20

I would like to know whether expr variable created within loop is available outside loop for, for example, could I do something like below?

          yes

or I need to declare variable expr before loop for using SET sentence?

          no

LET another_expr = expr;  // What is the value for expr here? 20?

          yes

[#6]

Thanks for your example and for your detailed explanation