Loops For While Do While Break Continue Nested Loops

Continue your JavaScript Tutorial learning path with hands-on explanation, code practice, and quiz.

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Course

JavaScript Tutorial

Estimated Time

8 min

Progress

Track Position

5 / 73

Lesson Overview

Simple Explanation

for known iterations ke liye, while condition based loops ke liye, do while at least ek dafa run hota hai. break loop rokta hai aur continue current iteration skip karta hai.

Code Explanation

Outer aur inner loops multiplication grid ka pattern banate hain.

Output Description

Console me counting aur nested table output aayega.

Practice Exercise

1 se 20 tak even numbers print karo aur 13 par break use karo.

Extra Explanation

Why This Matters

Loops For While Do While Break Continue Nested Loops is core to dynamic behavior. Strong fundamentals here help you build forms, API flows, and interactive UI with confidence.

Real-World Workflow

Complex features are usually split into small functions, then verified through focused logging and tiny test cases.

Common Mistakes to Avoid

Avoid uncontrolled globals, weak error handling, and ignored async states. Define clear input-output expectations for each function.

Example + Live Practice

<script>
  for (let i = 1; i <= 5; i++) {
    if (i === 3) continue;
    console.log("for loop", i);
  }

  let n = 1;
  while (n <= 3) {
    console.log("while", n);
    n++;
  }

  let x = 1;
  do {
    console.log("do while", x);
    x++;
  } while (x <= 2);

  for (let r = 1; r <= 2; r++) {
    for (let c = 1; c <= 3; c++) {
      console.log("cell " + r + "-" + c);
    }
  }
</script>

Try It Yourself

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