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
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
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.
doStuff() for i in [0 .. 9] This is explained on the introduction page: http://coffeescript.org/#loops Edit/Update by JP: The exact translation is: doStuff() for i in [0…10] You need to be careful with the “..” vs “…”, for example: count = 0 doStuff() for i in [0..count] #still executes once! So you think, no problem… … Read more
Your approach would take linear time for each insertion. A better way would be to use a map[int]struct{}. Alternatively, you could also use a map[int]bool or something similar, but the empty struct{} has the advantage that it doesn’t occupy any additional space. Therefore map[int]struct{} is a popular choice for a set of integers. Example: set … Read more
pairs() and ipairs() are slightly different. pairs() returns key-value pairs and is mostly used for associative tables. key order is unspecified. ipairs() returns index-value pairs and is mostly used for numeric tables. Non numeric keys in an array are ignored, while the index order is deterministic (in numeric order). This is illustrated by the following … Read more
You can use the Iterator::enumerate method: fn main() { let v = vec![1; 10]; for (pos, e) in v.iter().enumerate() { println!(“Element at position {}: {:?}”, pos, e); } } Playground
For Swift 2 and later: Swift 2 adds case patterns to for loops, which makes it even easier and safer to type cast in a for loop: for case let button as AClass in view.subviews { // do something with button } Why is this better than what you could do in Swift 1.2 and … Read more