Scratch

whf4 · 2012-03-28 23:23:55

Hi, All.

Apologies if this si well known, but I googled and searched, maybe ineffectively.

In a sentence-parsing script, I would like to be able to calculate the name of a variable to be set, but I cannot place an expression in the 'set' block, like I can in the costume block. Kind of like pointers and casts.

for example

change to [(join "costume" counter)]

lets the script calculate which costume to change to based on user input or elapsed time or whatever.

however

set (join "varname" index) to c

doesn't seem to exist.

Any ideas?

thanks!

Bill

lukanater · 2012-03-28 23:32:43

I don't think you can create a variable automatically, which is what I think you wish to do. You need to create a new one from the variables tab.

ProgramCAT · 2012-03-28 23:36:54

You can use a list.

whf4 · 2012-03-28 23:43:35

@lukanater: Thank you! I want to dynamically choose which of several pre-exisiting variables I am setting

@ProgramCAT: thank you, was wondering if there was a way to pass a variable name to set rather than using a list, but could use list instead.

ProgramCAT · 2012-03-28 23:49:13

You can't insert expressions as variable names.

whf4 · 2012-03-29 07:33:58

That might be a great thing to put on a wishlist. Thanks for your help!

Hardmath123 · 2012-03-29 09:18:48

First of all, it is generally frowned upon to calculate and use variable names in any language. In JavaScript, it is literally a sin to use "eval('var thing'+index+' = 0;')".

You should use a list. Create a list called "myVars", then use the following script:

when gf clicked
repeat (number of variables you need)
add [null] to [myVars v]
end

Then you use these blocks to edit them:

say (item (index) of [myVars v])
replace item (index) of [myVars v] with (join [Hey, this ] [works! Thanks, Hardmath123!])

Hope this helped! smile

Last edited by Hardmath123 (2012-03-29 09:20:23)

whf4 · 2012-03-29 19:06:30

yes, thank you, I knew you could do this with lists. Not sure I concur with your global horror of calculating variable names, but I agree an indexed array is cleaner.

bobbybee · 2012-03-29 19:42:07

whf4 wrote:
yes, thank you, I knew you could do this with lists. Not sure I concur with your global horror of calculating variable names, but I agree an indexed array is cleaner.

In a language like JavaScript, a malicious user could hack the program quite easily indeed.

roijac · 2012-03-30 07:10:12

whf4 wrote:
yes, thank you, I knew you could do this with lists. Not sure I concur with your global horror of calculating variable names, but I agree an indexed array is cleaner.

it's not THAT bad, but it's a really bad thing to do if there's an alternative like lists.

Scratch

archived forums

#1 2012-03-28 23:23:55

How to use calculated variable names?

#2 2012-03-28 23:32:43

Re: How to use calculated variable names?

#3 2012-03-28 23:36:54

Re: How to use calculated variable names?

#4 2012-03-28 23:43:35

Re: How to use calculated variable names?

#5 2012-03-28 23:49:13

Re: How to use calculated variable names?

#6 2012-03-29 07:33:58

Re: How to use calculated variable names?

#7 2012-03-29 09:18:48

Re: How to use calculated variable names?

#8 2012-03-29 19:06:30

Re: How to use calculated variable names?

#9 2012-03-29 19:42:07

Re: How to use calculated variable names?

whf4 wrote:

#10 2012-03-30 07:10:12

Re: How to use calculated variable names?

whf4 wrote:

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