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In computer programming, foreach loop (or for-each loop) is a control flow statement for traversing items in a collection. foreach is usually used in place of a standard for loop statement . Unlike other for loop constructs, however, foreach loops [ 1 ] usually maintain no explicit counter: they essentially say "do this to everything in this ...
Iterating over a container is done using this form of loop: for e in c while w do # loop body od; The in c clause specifies the container, which may be a list, set, sum, product, unevaluated function, array, or object implementing an iterator. A for-loop may be terminated by od, end, or end do.
For Each item In set instructions Next item: Visual Basic .NET: For i« As type» = first To last« Step 1» instructions Next« i» For Each item« As type» In set instructions Next« item» Xojo: While condition instructions Wend: Do Until notcondition instructions Loop or Do instructions Loop Until notcondition: Python: while condition :
The next example illustrates a PHP class that implements the Traversable interface, which could be wrapped in an IteratorIterator class to act upon the data before it is returned to the foreach loop. The usage together with the MYSQLI_USE_RESULT constant allows PHP scripts to iterate result sets with billions of rows with very little memory usage.
a There is no special construct, but users can define general loop functions. a The C++11 standard introduced the range-based for. In the STL, there is a std::for_each template function which can iterate on STL containers and call a unary function for each element. [22] The functionality also can be constructed as macro on these containers. [23 ...
PHP supports standard C/C++ style comments, but supports Perl style as well. Python The use of the triple-quotes to comment-out lines of source, does not actually form a comment. [ 21 ]
NFL HOT SEAT RANKINGS, ODDS: Doug Pederson, Matt Eberflus lead list of possible firings. NFL Week 12: Sunday game schedule. All times Eastern. Kansas City Chiefs at Carolina Panthers. Time: 1 p.m ...
In the ECMAScript example, return x will leave the inner closure to begin a new iteration of the forEach loop, whereas in the Smalltalk example, ^x will abort the loop and return from the method foo. Common Lisp provides a construct that can express either of the above actions: Lisp (return-from foo x) behaves as Smalltalk ^x , while Lisp ...