Based on the other answers, I think the cleanest solutions are #Handles None return from get_list for item in get_list() or []: pass #do something or the comprehension equiv result = [item*item for item in get_list() or []]
Yes. It uses the same syntax as lifetimes. fn main() { ‘outer: for x in 0..5 { ‘inner: for y in 0..5 { println!(“{},{}”, x, y); if y == 3 { break ‘outer; } } } } See loop labels documentation and the related section of the reference.
In Kotlin you can use this syntax: for (a in 1..10) print(“$a “) // >>> 1 2 3 4 5 6 7 8 9 10 for (a in 10 downTo 1 step 2) print(“$a “) // >>> 10 8 6 4 2 As for “why was the indexed loop removed” – scroll down for @yole’s … Read more
for(;;) { } functionally means while (true) { } It will probably break the loop/ return from loop based on some condition inside the loop body. The reason that for(;;) loops forever is because for has three parts, each of which is optional. The first part initializes the loop; the second decides whether or not … Read more
This is because there is only a single loop variable chart, and in each iteration just a new value is assigned to it. So if you attempt to take the address of the loop variable, it will be the same in each iteration, so you will store the same pointer, and the pointed object (the … Read more
A do..while can more directly be emulated in Go with a for loop using a bool loop variable seeded with true. for ok := true; ok; ok = EXPR { } is more or less directly equivalent to do { } while(EXPR) So in your case: var input int for ok := true; ok; ok … Read more
Either use return, as the closure basically is a method that is called with each element as parameter like def myObj = [“Hello”, “World!”, “How”, “Are”, “You”] myList.each{ myObj-> if(myObj==null){ return } println(“My Object is ” + myObj) } Or switch your pattern to def myObj = [“Hello”, “World!”, “How”, “Are”, “You”] myList.each{ myObj-> if(myObj!=null){ … Read more
In Swift 2, new where syntax was added: for value in boolArray where value == true { … } In Pre 2.0 one solution would be to call .filter on the array before you iterate it: for value in boolArray.filter({ $0 == true }) { doSomething() }
Yes, await is permitted inside a for loop in Dart, and it will work as expected. for (var o in objects) { await doSomething(o); } And there is even await for for Streams, if that’s what you’re looking for: await for (var event in eventStream) { print(“Event received: $event”); } Your example works correctly in … Read more
Another Alternative using defined and a loop that doesn’t require delayed expansion: set Arr[0]=apple set Arr[1]=banana set Arr[2]=cherry set Arr[3]=donut set “x=0” :SymLoop if defined Arr[%x%] ( call echo %%Arr[%x%]%% set /a “x+=1″ GOTO :SymLoop ) Be sure you use “call echo” as echo won’t work unless you have delayedexpansion and use ! instead of … Read more