!Executed for all values of "I", up to a disaster if any. A While Loop is structure you use to execute a block of code repeatedly until a given condition is met. The key difference between for Loop and foreach loop is that the for loop is a general purpose control structure while the foreach loop is an enhanced for loop that is applicable only to arrays and collections. Nim has a foreach-type loop and various operations for creating iterators. Initializer: The initializer section is used to initialize a variable that will be local to a for loop and cannot be accessed outside loop. 3. for loop_variable in sequence: #Write code here to execute for each iteration Where a sequence can be a list, tuple, array etc. A for loop is a loop that runs for a preset number of times. for (const i of iterable) {console. The syntax for a three-expression for-loop is nearly identical in all languages that have it, after accounting for different styles of block termination and so on. CONTENTS. The for loop is distinguished from other looping statements through an explicit loop counter or loop variable which allows the body of the loop to know the exact sequencing of each iteration. The loop body is executed "for" the given values of the loop variable, though this is more explicit in the ALGOL version of the statement, in which a list of possible values and/or increments can be specified. While Loop. Some languages require a separate declaration of the control variable, some do not. Straight From the Programming Experts: What Functional Programming Language Is Best to Learn Now? O    With each iteration of the FOR LOOP statement, its statements run, its index is either incremented or decremented, and control returns to the top of the loop. Types of Loops . It looks a lot like an if statement. However, only overt changes are likely to be detected by the compiler. Here, the loop iterates until all the elements of the array are examined. The For loop is used in many imperative programming languages notably C and C++ and comes from the English word 'for' which is used to state the purpose of an object or action, in this case the purpose and details of the iteration. A for loop is a fundamental concept of programming. The for statement is useful for any repetitive operation, and is often used in combination with … This loop is interpreted as follows: Initialize i to 1.; Continue looping as long as i <= 10.; Increment i by 1 after each loop iteration. A for statement also terminates when a break, goto, or return statement within the statement body is executed. NOTE: It will only exit from the inner loop (Second loop) but not from the entire loop. Even ignoring minor differences in syntax there are many differences in how these statements work and the level of expressiveness they support. Q    A Survey of Definite Iteration in Programming. J    New merged question × 160 character left. It can iterate over the elements of any sequence, such as a list. 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 usually maintain no explicit counter: they essentially say "do this to everything in this set", rather than "do this x times". The LEAVE statement may be used to exit the loop. For this reason it is also called Entry control loop; Once the condition is evaluated to true, the statements in the loop … Ignoring the need for declaring and initialising variables, the COBOL equivalent of a for-loop would be. In computer programming a loop counter is the variable that controls the iterations of a loop (a computer programming language construct).