🔀 Control Flow Statements

Last Updated: 9th October 2025

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Control Flow Statements decide which part of your program will run, when, and how many times. They give your program the ability to make decisions and repeat tasks.

Hinglish Tip 🗣: Control Flow ka kaam hai decide karna ki program kaunsa step pehle chalega, kaunsa baad me, kisko repeat karega aur kaunsa skip karega.

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Why Control Flow is Important?

Without control flow, JavaScript would just run your code line-by-line from top to bottom. Control flow lets you:

• Run different code based on a condition.
• Repeat code multiple times.
• Skip or stop parts of a loop.

Real-life Analogy:

• Conditional: If it’s raining, take an umbrella.
• Loop: Walk until you reach your destination.
• Jump: If you see danger, stop immediately.

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Main Categories

1. Conditional Statements — Decision making.
2. Looping Statements — Repeat a block of code.
3. Jump/Transfer Statements — Change the normal sequence of execution.

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Category	Keywords	Purpose
Conditional	if, else if, else, switch	Run different code based on a condition
Looping	for, while, do...while, for...in, for...of	Repeat code multiple times
Jump	break, continue	Skip or stop parts of a loop

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Code Previews

Conditional Example:

let x = 10;

if (x > 0) {
  // Conditional
  console.log("Positive number");
} else {
  console.log("Non-positive number");
}

// switch example
let color = "red";
switch (color) {
  case "red":
    console.log("Stop!");
    break;
  case "green":
    console.log("Go!");
    break;
  default:
    console.log("Caution!");
}

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Loop Example:

for (let i = 0; i < 3; i++) {
  console.log("Loop iteration:", i);
}

let j = 0;
while (j < 3) {
  console.log("While loop:", j);
  j++;
}

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Jump Example:

for (let i = 0; i < 5; i++) {
  if (i === 2) continue; // Skip iteration
  if (i === 4) break; // Stop loop
  console.log(i);
}

💡 Don’t worry! We’ll explore each of these in full detail in the next sections.

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