Programming languages which support foreach loops include ABC, ActionScript, Ada, C++11, C#, ColdFusion Markup Language (CFML), Cobra, D, Daplex (query language), Delphi, ECMAScript, Erlang, Java (since 1.5), JavaScript, Lua, Objective-C (since 2.0), ParaSail, Perl, PHP, Prolog, Python, R, REALbasic, Rebol, Red, Ruby, Scala, Smalltalk, Swift, Tcl, tcsh, Unix shells, Visual Basic. Most use the simple word for, roughly as follows: This simplifies loop optimization in general and in particular allows vector processing of items in the collection concurrently. The foreach statement in many other languages, especially array programming languages, does not have any particular order. The foreach statement in some languages has some defined order, processing each item in the collection from the first to the last. In object-oriented languages, an iterator, even if implicit, is often used as the means of traversal. This avoids potential off-by-one errors and makes code simpler to read.

Unlike other for loop constructs, however, foreach loops usually maintain no explicit counter: they essentially say 'do this to everything in this set', rather than 'do this x times'. foreach is usually used in place of a standard for loop statement. In computer programming, foreach loop (or for-each loop) is a control flow statement for traversing items in a collection.

Javascript for each array