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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 ...
Foreach loops; While loops; For loops; Do-while; ... JavaScript: semicolon separated (but often inserted as statement terminator) ... Bourne shell, C shell, Maple ...
(with-hash-table-iterator (entry-generator phone-book) (loop do (multiple-value-bind (has-entry key value) (entry-generator) (if has-entry (format T "~&~s => ~s" key value) (loop-finish))))) It is easy to construct composite abstract data types in Lisp, using structures or object-oriented programming features, in conjunction with lists, arrays ...
Shell, scripting: Yes Yes No Yes No No Several variants, custom programmable, dynamic loadable modules Optionally POSIX.2 [13] LabVIEW (G) Application, industrial instrumentation-automation Yes Yes Yes No No No Dataflow, visual: No Lisp: General No No Yes No No No Unknown LiveCode: Application, RAD, general Yes Yes No Yes No Yes Weakly typed ...
Comparison of programming languages; General comparison; Assignment; Basic syntax; Basic instructions; Comments; Control flow Foreach loops; While loops; For loops
Foreach loops; While loops; For loops; Do-while; ... JavaScript (ES6) class name ... loop instructions variant tag: expression end:
(loop for item in list do instructions) or (loop for item across vector do instructions) or (dolist (item list) instructions) or (mapc function list) or (map type function sequence) Scheme (do (notcondition) instructions) or (let loop (if condition (begin instructions (loop)))) (let loop (instructions (if condition (loop))))
The loop counter is used to decide when the loop should terminate and for the program flow to continue to the next instruction after the loop. A common identifier naming convention is for the loop counter to use the variable names i , j , and k (and so on if needed), where i would be the most outer loop, j the next inner loop, etc.