On Jan 19, 11:31 pm, Ran Berenfeld <[email protected]> wrote:
> Hello all
>
> sorry for this stupid question, but all these talks about the "*this"
> pointer and the variable
> scope in js got me confused.
A function's this keyword has nothing to do with scope.
> support I have 2 functions, one calling the other inside array iteration.
> can they both
> use the same local variable for array index ?
Yes, if that's what you want to do. There are a number of ways to do
that.
> should I use a "var" statement ?
Yes, always.
>
> for example :
>
> function B()
By convention, function names starting with a captial letter are
reserved for constructors.
> {
> for(i=0;i<array_b_length;i++)
You should declare i as a local variable (and I think you have a typo
with array_b_lengh), so:
for (var i=0; i < array_b.length; i++)
Variables that aren't declared locally become global variables at the
point in execution when the statement that creates them is executed.
If neither A or B are called, or if the for loops are never executed,
this code will not create a global i variable.
> {
> ...
> }
>
> }
>
> function A()
> {
> for(i=0;i<array_a.length;i++)
> {
> B()
> ...
> }
> }
If this code is run unmodified, when A is called a global variable i
will be created. When A calls B, it will access the same variable.
Since the for loop in B initially assigns 0 to i, its loop will run
OK, but when control returns to A, the value of i will be whatever it
was when B finished with it (in this case, array_b.length). So if
array_a.length <= array_b.length+1 then the for loop in A will only
run one loop.
--
Rob
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