The three forms of looping are nearly identical. The enhanced for loop: for (E element : list) { . . . } is, according to the Java Language Specification, identical in effect to the explicit use of an iterator with a traditional for loop. In the third case, you can only modify the list contents … Read more
while true; do foo; sleep 2; done By the way, if you type it as a multiline (as you are showing) at the command prompt and then call the history with arrow up, you will get it on a single line, correctly punctuated. $ while true > do > echo “hello” > sleep 2 > … Read more
To break a $.each or $(selector).each loop, you have to return false in the loop callback. Returning true skips to the next iteration, equivalent to a continue in a normal loop. $.each(array, function(key, value) { if(value === “foo”) { return false; // breaks } }); // or $(selector).each(function() { if (condition) { return false; } … Read more
In Python 2.x: range creates a list, so if you do range(1, 10000000) it creates a list in memory with 9999999 elements. xrange is a sequence object that evaluates lazily. In Python 3: range does the equivalent of Python 2’s xrange. To get the list, you have to explicitly use list(range(…)). xrange no longer exists.
break will exit the loop completely, continue will just skip the current iteration. For example: for (int i = 0; i < 10; i++) { if (i == 0) { break; } DoSomeThingWith(i); } The break will cause the loop to exit on the first iteration – DoSomeThingWith will never be executed. This here: for … Read more
.values() You can call the values() method on your enum. for (Direction dir : Direction.values()) { // do what you want } This values() method is implicitly declared by the compiler. So it is not listed on Enum doc.
Use the built-in reversed() function: >>> a = [“foo”, “bar”, “baz”] >>> for i in reversed(a): … print(i) … baz bar foo To also access the original index, use enumerate() on your list before passing it to reversed(): >>> for i, e in reversed(list(enumerate(a))): … print(i, e) … 2 baz 1 bar 0 foo Since … Read more
for (var key in validation_messages) { // skip loop if the property is from prototype if (!validation_messages.hasOwnProperty(key)) continue; var obj = validation_messages[key]; for (var prop in obj) { // skip loop if the property is from prototype if (!obj.hasOwnProperty(prop)) continue; // your code alert(prop + ” = ” + obj[prop]); } }
One way to do it is: while read p; do echo “$p” done <peptides.txt As pointed out in the comments, this has the side effects of trimming leading whitespace, interpreting backslash sequences, and skipping the last line if it’s missing a terminating linefeed. If these are concerns, you can do: while IFS=”” read -r p … Read more
Like other answerers, I’d definitely prefer to put the loops in a different method, at which point you can just return to stop iterating completely. This answer just shows how the requirements in the question can be met. You can use break with a label for the outer loop. For example: public class Test { … Read more