Loops & Iteration
Repeat code efficiently with different types of loops. Learn for loops, while loops, do-while loops, and modern iteration methods. Master control flow with break, continue, and nested loops.
Learn in Multiple Languages
What You'll Learn
For loops and loop counters
While and do-while loops
For...of and for...in loops
Break and continue statements
Nested loops and patterns
Loop optimization and best practices
Frequently Asked Questions
When should I use a for loop vs a while loop?
Use for loops when you know the number of iterations in advance (like iterating over an array). Use while loops when the condition depends on runtime factors or when you don't know how many iterations you need.
What is the difference between break and continue?
break exits the loop completely and continues with code after the loop. continue skips the rest of the current iteration and moves to the next iteration. Both are useful for controlling loop flow.
How can I avoid infinite loops?
Always ensure your loop condition will eventually become false. Make sure loop counters are updated correctly. Use break statements as safety exits when appropriate. Test loops with small datasets first.
Ready to Master Loops & Iteration?
Choose a language above to start practicing with interactive fill-in-the-blank exercises. Build real coding fluency through hands-on practice.