Problems with slice function

Squirrel Code
#1

I have a very basic problem with a slice function…

I am trying out different things and now I’m testing the webcolor function, but with my own RGB LED setup. However, I cannot seem to pass the correct values… First of all, the code in webcolor accepts the HTTP value as “color” - is that correct? Shouldn’t it be rather string function, as we try to slice it further on in the code?

Then I tried to do very basic changes - I’ve changed the HTML code to input “string” rather than color, deleted and added a new node which passes string to my code and tried to return the sliced value:

`class RGBcolor extends InputPort
{
name = "RGB"
type = “string”

function set(col) {
    server.log(col.slice(1,3));

}
}`

That code fails with:
3 luty 2013 23:10:21: ERROR: the index ‘slice’ does not exist
3 luty 2013 23:10:21: ERROR: at set:44

Code server.log(col); returns the value correctly… What am I doing wrong?

#2

Try server.log(typeof col); to see if it’s actually coming through as a string?

#3

Oh, I see. “FF0000” comes through as string, “000000” comes as integer. I can prepend it with a character and analyze the rest… Any other way to make it explicit?

#4

Still something is amiss… If I send “F12345”, col.slice (1,3) returns “12”…

#5

No, no way to make it explicit (once it’s converted to an int, you can’t get back to what it was as a string). Again, agents make this easier.

The slice (1,3) is returning the right value. Strings are zero-indexed and the end value is not included, so you should expect to see a 2 character string “12” returned.

See squirrel docs:

slice(start,[end])
returns a section of the array as new array. Copies from start to the end (not included). If start is negative the index is calculated as length + start, if end is negative the index is calculated as length + end. If end is omitted end is equal to the array length.

#6

I missed that part about zero index - looking at the webcolor code I figured it started with one (I figured wrong of course - the web input starts with # and I missed that too).