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how to test if a table exist or not

WTony

Hi,

I'm trying to verify is a table exist, if not the it will create it.

if(tablep(My_table) then
       for( i 2 length(word)/2-1
              My_table[list(nthelem(2 word) nthelem(2*i+1 word))] = nthelem(2*i+2 word)
       )
else
       My_table=makeTable("Table")
)

Message: *Error* eval: unbound variable - My_table

I can use "boundp" to test it but if they have "tablep" function, it should be able to work.

Thanks

  • Hi Yu Hao,

    I think that you need to combine the boundp() test AND the tablep() test:

    
if(and(boundp('My_table) tablep(My_table)) then
  for(i 2 length(word)/2-1
    My_table[list(nthelem(2 word) nthelem(2*i+1 word))] = nthelem(2*i+2 word)
  )
else 
  My_table=makeTable("Table") 
)

    However, if your "My_table" variable is declared in a 'let()' statement it will already exist and have a default value of 'nil', so I guess you have not declared the variable?

    Best regards,

    Lawrence.

  • in reply to skillUser

    thanks,

    yes, I didn't declare it in the let(). after declare it, it works

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