foreach
Why Array.forEach is slower than for() loop in Javascript? [duplicate]
Updated based on feedback from @BenAston & @trincot Roughly, this is what’s happening in both cases: For loop Set the index variable to its initial value Check whether or not to exit the loop Run the body of your loop Increment the index variable Back to step 2 The only overhead that happens on every … Read more
Detecting the first iteration through a for-each loop in Java
One simpler way for this situation is to note that you can always append an empty string: // For the first iteration, use a no-op separator String currentSeparator = “”; for (String s : list) { builder.append(currentSeparator); builder.append(s); // From the second iteration onwards, use this currentSeparator = separator; } Alternatively (and preferrably) use Guava’s … Read more
How to stop/break forEach loop in dart /flutter?
Can’t break forEach with Dart. You can use for and indexOf for (var number in id) { var index = id.indexOf(number); print(‘Origin forEach loop’); for (int i = 0; i < 1; i++) { print(“for loop”); } break; }
Enhanced for loop compiling fine for JDK 8 but not 7
This should actually compile fine for JDK 7 and 8. Quoting JLS section 14.14.2 (which is the same for the Java 7 specification): The enhanced for statement is equivalent to a basic for statement of the form: for (I #i = Expression.iterator(); #i.hasNext(); ) { {VariableModifier} TargetType Identifier = (TargetType) #i.next(); Statement } Rewriting the … Read more
Java Foreach with a condition
No. You could use a while loop instead. Iterator iterator = list.iterator(); while(iterator.hasNext()) { … }
How to iterate with foreach loop over java 8 stream
By definition foreach loop requires an Iterable to be passed in. It can be achieved with anonymous class: for (String s : new Iterable<String>() { @Override public Iterator<String> iterator() { return stream.iterator(); } }) { writer.append(s); } This can be simplified with lambda because Iterable is a functional interface: for (String s : (Iterable<String>) () … Read more
Why can’t I do foreach (var Item in DataTable.Rows)?
Rows effectively returns IEnumerable (DataRowCollection), so the compiler can only pick object as the type for var. Use Rows.Cast<DataRow> if you want to use var. Cast is defined on Enumerable, so you have to include System.Linq.