Loop

For Loops in Batch

Learn the many forms of the batch for command: iterating lists, ranges, files, directories, and command output with %%variables.

Logic Controllers: If, Loop, and Transaction

Master JMeter's If Controller, Loop Controller, and Transaction Controller to build test plans with conditional branches, repeated actions, and grouped metrics…

The Scheduler

How Airflow's scheduler parses DAGs, evaluates dependencies, and triggers task instances to keep pipelines running on time.

Loops in Fortran

Fortran's DO, DO WHILE, and indefinite loop constructs, plus EXIT and CYCLE control flow.

Loops in Arduino

Understand the built-in loop() function and the for, while, and do-while loops that repeat actions inside an Arduino sketch.

Loops in R

How R's for, while, and repeat loops work, including break/next control flow and the classic vector-preallocation performance fix.

Loops in D

Master D's looping constructs -- while, do-while, for, foreach, and foreach_reverse -- including range iteration and loop control.

Recursion and loop/recur

Learn how Clojure handles recursion without mutable loop variables, and how the recur special form enables safe, stack-efficient tail recursion via loop and fu…

Loops in Ansible

Use the 'loop' keyword and its variants to run a single task repeatedly over lists, dictionaries, and nested data structures.

Advanced Loop Patterns

Go beyond basic for loops with C-style iteration, while-read idioms for safe line processing, and loop control with break, continue, and select.

do-while Loop in C++

Learn how the C++ `do-while` loop guarantees at least one execution by checking its condition after the body runs, with a full iteration trace.

for Loop in C++

Learn the C++ `for` loop syntax, how init/condition/increment control iteration, and when it is the best choice for a known number of repetitions.

while Loop in C++

Understand the C++ `while` loop, how its entry condition is tested before every iteration, and when to use it over a `for` loop.

Loops in C (for, while, do-while)

Complete guide to C loops — for, while, and do-while — with syntax, execution order, examples, and exam-focused comparisons.

for Loop in Java

Understand Java's classic three-part for loop and the enhanced for-each loop for iterating over arrays and collections concisely.

while and do-while Loops in Java

Learn the difference between Java's entry-controlled while loop and exit-controlled do-while loop, including syntax, semantics, and common pitfalls.

for Loop in Python

Understand how Python's for loop iterates over sequences and iterables like lists, strings, and ranges.

while Loop in Python

Learn how Python's while loop repeats code as long as a condition stays True, and how to avoid infinite loops.

The Event Loop in JavaScript

Understand the call stack, macrotask queue, and microtask queue, and master the ordering rules that govern async execution.

for Loop in JavaScript

Master the classic for loop along with for...in and for...of, and understand the key differences between iterating indexes, keys, and values.

Loops in Rust (loop, while, for)

Understand Rust's three loop constructs — loop, while, and for — and how loop can return a value with break.

Node.js Architecture and the Event Loop

Understand Node.js's single-threaded, non-blocking architecture and how the event loop phases process callbacks.

Loops in Ruby

A tour of Ruby's repetition constructs — while, until, for, loop, and the more idiomatic times/each iterators — with guidance on which one to reach for.

Test-Driven Development (TDD) Cheat Sheet

Covers the red-green-refactor loop, writing the smallest failing test first, test doubles, and common TDD anti-patterns to avoid.

Kubernetes Operators Cheat Sheet

Kubernetes Operator pattern covering CRDs, controller reconcile loops, Kubebuilder/Operator SDK scaffolding, and status subresources.