OpenEuphoria

2. Re: Returning the var type based on content of object

• Posted by DerekParnell (admin) May 13, 2009
• 859 views

I suggest you actually benchmark this before deciding which is faster.

------------------------------------------------------------------------------------------------ 
                              global function fVarType(object oObject)         -->> cGA08, uGA08 
------------------------------------------------------------------------------------------------ 
  -->> Purpose: Return A, N, F or E depending on the oObject content; 
  -->> 'A'tom 
  -->> 'N'ested sequence (Array) 
  -->> 'F'lat sequence (May be considered as a string) 
  -->> 'E'mpty sequence 
  -->> ========================================================================================= 
  -->> GA08; Created. 
  -->> ========================================================================================= 
  -- 
  atom xType 
  -- 
  -- 
  if  atom(oObject)	then return 'A' end if 
  if length(oObject) = 0 then return 'E' end if 
  -- 
  if   sequence(oObject[1]) -- Most nested sequences nest on the 1st element. 
  then return 'N' 
  end if 
  for cnt = 2 to length(oObject) do 
    if   sequence(oObject[cnt]) 
    then return 'N' 
    end  if 
  end for 
  -- 
  return 'F' 
  -- 
  end function 

4. Re: Returning the var type based on content of object

• Posted by mattlewis (admin) May 13, 2009
• 878 views

The for loop never executes, so execution jumps right to the final return statement.

Taking advantage of eu 4.0's inlining capability, I split the nested check out to its own function. The advantage here is that we don't have to check to see if oObject is a sequence before trying to subscript it. This is really only an advantage when interpreted. Translated code doesn't do all the checks that interpreted code does.

I get these results with eui.exe r2005:

ZNorq: 6.031 
Derek: 5.86 
Matt:  5.64 

global function znorq(object oObject) 
	atom xType  
	xType = 'F'  
	if  atom(oObject)	then return 'A' end if  
	if equal(oObject, "") then return 'E' end if  
	for cnt = 1 to length(oObject) do  
		if   sequence(oObject[cnt])  
			then xType = 'N'  
			exit  
		end  if  
	end for  
	return xType  
end function  
 
global function derek(object oObject)         -->> cGA08, uGA08  
	atom xType  
	xType = 'F'  
	if  atom(oObject)	then return 'A' end if  
	if equal(oObject, "") then return 'E' end if  
	if sequence(oObject[1]) -- Most nested sequences nest on the 1st element.  
		then return 'N'  
	end if  
	 
	for cnt = 2 to length(oObject) do  
		if   sequence(oObject[cnt])  
			then xType = 'N'  
			exit  
		end  if  
	end for  
	return xType  
end function  
 
with inline 60 
function is_nested( sequence s, integer len = length(s) ) 
	for cnt = 2 to len do  
		if sequence(s[cnt]) then 
			return 1 
		end  if  
	end for 
	return 0 
end function 
 
global function matt(object oObject)         -->> cGA08, uGA08  
	if  atom(oObject)	then return 'A' end if  
	if equal(oObject, "") then return 'E' end if  
	if sequence(oObject[1]) -- Most nested sequences nest on the 1st element.  
		then return 'N'  
	end if  
	if is_nested( oObject ) then 
		return 'N' 
	else 
		return 'F' 
	end if 
end function  
 
 
constant DATA =  
	{ 1, 1.5, "", "sfdsdfdsfsdf", { {}, 3, {}}, {1, 3.0, "hello"} } 
 
constant REPS = 5000000 
atom zt, dt, mt 
object void 
 
zt = time() 
for i = 1 to REPS do 
	for j = 1 to length( DATA ) do 
		void = znorq( DATA[j] ) 
	end for	 
end for 
zt = time() - zt 
 
 
dt = time() 
for i = 1 to REPS do 
	for j = 1 to length( DATA ) do 
		void = derek( DATA[j] ) 
	end for	 
end for 
dt = time() - dt 
 
mt = time() 
for i = 1 to REPS do 
	for j = 1 to length( DATA ) do 
		void = matt( DATA[j] ) 
	end for	 
end for 
mt = time() - mt 
 
printf(1, "ZNorq:  %g\nDerek: %g\nMatt:  %g\n", {zt, dt, mt}) 
 

Matt

6. Re: Returning the var type based on content of object

• Posted by DerekParnell (admin) May 18, 2009
• 880 views

Sort of...

Given this code ...

  for cnt = 2 to length(oObject) do  
    if   sequence(oObject[cnt])  
    then return 'N'  
    end  if  
  end for  

The body of the 'for' loop is only executed when 'cnt' is less than or equal to the length of 'oObject'. So if 'cnt' starts at 2 and the length is 1, then the body will not execute because 'cnt' is not less than or equal to the length.

It has nothing to with counting up or down.