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So I found out that any variable or constant in swift is a tuple. For example, variable x below is a tuple
var x = 15
and following statement is valid and evaluates to value of x as the first element of tuple
x.0.0.0.0.0.0.0.0.0.0.0 // outputs 15
I'm wondering why the language has been built to accommodate this. Any known (or outworldly) use case?
I don't know can it be the right answer, but it gives some information and shows that it's a known thing. Look this 2 sections:
Special: The 1-Tuple
Bonus Track: Tuples All the Way Down
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I got an error when I ran cv2.fillPoly(color_warp, pts, (0,255, 0)) and then recognized pts needed to be int32.
But why does it need to be int32 ?
pts holds an array of array of points on an image. An image is a matrix of Scalars. It is indiced by (X, Y) values which can be stored quite adequately in int32.
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I've been searching for a clean and correct way to convert an NSDecimalNumber retrieved from CoreData to a Double.
I'm looking for a recommendation on how to do this. I need to take 2 decimal numbers from my CoreData and calculate a percentage to use in a progress bar etc.
NSDecimalNumber has a property var doubleValue: Double { get }. So you can say num.doubleValue.
For division of two NSDecimalNumbers you should use num1.dividing(by: num2).
Keep in mind that in Swift you can also use Decimal which supports +, *, /, etc.
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How to write something
if !inBoundary then do
printfn "no it's not within the boundary"
You can use the not built-in function (and omit the do keyword after then):
let inBoundary = false
if not inBoundary then
printfn "no it's not within the boundary"
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I have a string from user input that is in the following format:
"foo\U+FFE2\U+FFB5\U+FFE2\U+FFB5"
When I view this it does not show anything in the browser or terminal, but they are definitely there.
What are they and how do I remove all junk chars like these to end up with just 'foo'?
I know I could just remove these specific ones but there maybe other different ones that I want just the text value from.
Any ideas?
I see the two main variants:
with #split/#join pair:
"fooффф".split('').select{|x|x.ord <= 127}.join
# => "foo"
with #unpack/#pack pair:
"fooффф".unpack('U*').select{|x| x <= 127}.pack('U*')
# => "foo"
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what is the shortest code to copy all checked items from a TChecklistBox into a TStringlist ?
( for a TListbox I can you the assign function to add and extract a TStringlist with data)
Using plain vanilla Delphi (i.e. without any third party libraries) you just write a for loop:
StringList.Clear;
for i := 0 to CheckListBox.Items.Count-1 do
if CheckListBox.Checked[i] then
StringList.Add(CheckListBox.Items[i]);