Fastest way to check if var contains numbers

[istech]

Hi all,

I was using some expressions in livecode and thought I could use this expression to solve a simple problem to check if there is a number in a var.

put "2,3,4" into t

if 1 or 2 or 3 is in t then --works but convoluted
answer "yes"
end if

put item 1 into x --works but is there a faster way to write it--looking for a line wonder.
if item 1 is a number then
answer "yes"
end if


if t contains a number then --does not work..but should? I know I am missing something simple.
answer "yes"
end if

[SparkOut]

if item 1 of t is a number then...

Now, did you want to ensure that all items of t contain a number for the condition to return true?

If so you, I think you would have to loop through the items to apply the test to each.

[istech]

If so you, I think you would have to loop through the items to apply the test to each.

That's what I was thinking. Just thought there was a quicker way.

example -
if the var contained nof3s would be true.
if var contained nofs would be false

Just was thinking why the "contain" can not be used. Anyway rules are rules.

[dunbarx]

Well, if you want to really waste a bit of spare time, and go out of the box, and use a klugey LC method, and might have a million items to worry about, then try this in a button script:

Code: Select all

on mouseUp
   repeat 1000000
      put "1," after temp
   end repeat
   try
      put "X" into the last item of temp
      if sum(temp) is a number then answer "Good Number"
   catch tError
     answer "Bad Number"
   end try
end mouseUp

Comment out the "put X" line after running this. You did ask for "fast" you know.

Craig Newman

[cubist]

Hmmm… regex should work…

Code: Select all

put "2,3,4" into t

filter t with "*[0-9]*" -- this command looks for any of the 10 digits. if there is at least one digit in t, the filter will let it thru
if t <> "" then -- yes, the variable t does contain at least one digit
answer "yes"
else -- no, the variable t doesn't contain any digits
answer "no"
end if

I added the "answer 'no'" branch of that IF statement cuz I like to be thorough. Hope my code snippet helps…

[dunbarx]

Cubist.

That is the right way to do it.

Craig

[istech]

Hmmm… regex should work…

Code: Select all

put "2,3,4" into t

filter t with "*[0-9]*" -- this command looks for any of the 10 digits. if there is at least one digit in t, the filter will let it thru
if t <> "" then -- yes, the variable t does contain at least one digit
answer "yes"
else -- no, the variable t doesn't contain any digits
answer "no"
end if

I added the "answer 'no'" branch of that IF statement cuz I like to be thorough. Hope my code snippet helps…

Looks good to me. I wonder which will be quicker to loop through or filter? I will run a test. I wonder if there is large amount of text which would be quicker.

[Thierry]

I wonder which will be quicker to loop through or filter? I will run a test.
I wonder if there is large amount of text which would be quicker.

Hi,

For large amount of text, this one will be fast enough:

Code: Select all

  
put "a,b,c,d,4,e,f" into t
   
 if matchChunk( t, "\d") then   answer "Yes"
 else answer "No"

 

Your original list is not transformed, matchChunk(), or matchText(),
doesn't matter which one you choose in this case,
will only scan your datas.

Thierry