>In conjunction with my SkySVG project, some items that beg the question
>"Which is best?" Meaning, "best" from a speed and efficiency perspective.
>
>1. Accessing character ranges
>
>lsRAh = lsInputLine.char[6..9]
>
>-OR-
>
>lsRAh = chars(lsInputLine, 6, 9)
>
>-OR-
>
>lsRAh = char 6 to 9 of lsInputLine
I haven't done the function test yet, but chars(IsInputLine, 6, 9) seems to
be fastest in my test.
Here's my code:
on timeTextAccess
-- member "tx" is a text member with the string
-- "This is a line of text"
testText = member("tx").text
-- create a standardized list of starting positions
startPos = []
repeat with i = 1 to 100000
x=random(21) -- the length of the text - 2
startPos.append(x)
end repeat
startTime = the milliseconds
repeat with i = 1 to 100000
firstChar = startPos.getAt(i)
lastChar = firstChar + 2
testSubStr = testText.char[firstChar..lastChar]
end repeat
loopTime = the milliseconds - startTime
put "[x..y]: " & loopTime
startTime = the milliseconds
repeat with i = 1 to 100000
firstChar = startPos.getAt(i)
lastChar = firstChar + 2
testSubStr = chars(testText,firstChar, lastChar)
end repeat
loopTime = the milliseconds - startTime
put "chars(): " & loopTime
startTime = the milliseconds
repeat with i = 1 to 100000
firstChar = startPos.getAt(i)
lastChar = firstChar + 2
testSubStr = char firstChar to lastChar of testText
end repeat
loopTime = the milliseconds - startTime
put "char x to y of z: " & loopTime
end
And the result of 5 runs:
timeTextAccess
-- "[x..y]: 784"
-- "chars(): 568"
-- "char x to y of z: 646"
timeTextAccess
-- "[x..y]: 783"
-- "chars(): 590"
-- "char x to y of z: 648"
timeTextAccess
-- "[x..y]: 803"
-- "chars(): 571"
-- "char x to y of z: 702"
timeTextAccess
-- "[x..y]: 775"
-- "chars(): 572"
-- "char x to y of z: 694"
timeTextAccess
-- "[x..y]: 841"
-- "chars(): 610"
-- "char x to y of z: 665"
I keep coming back to the conclusion that dot syntax is slower. I know that
there are things you can't do with dot syntax, such as string assignment.
Are there things you can do with dot syntax you can't do with old notation?
Cordially,
Kerry Thompson
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