operator or method in swift which work as walrus operator of python

Question

walrus operator of python language ( := )
work:- assign the value & also return that value.

language like swift at value assign it return nothing.
how to implement walrus operator kind a thing in swift language ?

I think it done by make function, pass address of variable & value.
assign value in that address & return value.
Is this work or any other way for this?

Do you mean like `+=` and `-=`? `var x = 2; x += 2; //x is now 4`. If not perhaps you could supply a clearer example to your question — Joakim Danielson, Oct 23 '19 at 09:03
I mention walrus operator, work as... b = 10; while b > 0{ print(b := b-1) } this will print 9,8....0 — b m gevariya, Oct 23 '19 at 09:21
No I think you will need to split `print(b := b-1)` into `b -= 1; print(b)` — Joakim Danielson, Oct 23 '19 at 09:27
python also do same by splitting, but still they give this for best uses. I WAS want that by custom operator. — b m gevariya, May 28 '21 at 04:21

score 0 · Answer 1 · answered Oct 27 '19 at 06:32

Joakim is correct.

Swift doesn't have a unary operator like C.

In C, you could do:

b = 10;
while (b>0) {
   print(b--);
}

In Swift, there isn't a unary ++ or -- operator, so you would do:

var b = 10
while (b > 0) {
   print b
   b -= 1
}

but, really, in Swift, you'd do this instead

for b in (0...10).reversed() { 
   print b
}

See Reverse Range in Swift

operator or method in swift which work as walrus operator of python

1 Answers1