Stopping Loop Execution with the JavaScript break Statement

for (let i = 1;
i <= 10;
i++) {
  if (i === 4) {
    break;
    // 🛑 exit NOW  }  console.log(i);}
    console.log("Loop over!");

123Loop over!

// Find the first number divisible by 7for (let i = 1; i <= 50; i++) {  if (i % 7 === 0) {              // Lesson 12's modulus magic!    console.log(`First multiple of 7: ${i} ✅`);    break;  }}// First multiple of 7: 7 ✅  (8–50 never checked)

let fuel = 100;
while (fuel > 0) {
  fuel -= 15;
  console.log(`Flying… fuel at ${fuel}% ✈️`);
  if (fuel <= 40) {
    console.log("⚠️ Low fuel — emergency landing!");
    break;
    // stop the flight early  }}

Flying… fuel at 85% ✈️Flying… fuel at 70% ✈️Flying… fuel at 55% ✈️Flying… fuel at 40% ✈️⚠️ Low fuel — emergency landing!

let attempts = 0;
do {
  attempts++;
  let guess = Math.floor(Math.random() * 10) + 1;
  // Lesson 12's recipe  console.log(`Attempt ${attempts}: guessed ${guess}`);
  if (guess === 7) {
    console.log("🎉 Lucky 7 found!");
    break;
  }
} while (attempts < 100);
// safety cap from Lesson 18!

let emails =["a@x.com", "b@x.com", "target@x.com", "d@x.com"];
for (let email of emails) {
  if (email === "target@x.com") {
    console.log(`Found it: ${email} 🎯`);
    break;
    // stop searching immediately
  } console.log(`Checked ${email}…`);
}

let products =["mug", "lamp", "keyboard", "mouse", "monitor"];
let searchFor = "keyboard";
let foundIndex = -1;
for (let i = 0;
i < products.length;
i++) {
  if (products[i] === searchFor) {
    foundIndex = i;
    break;
    // found — no point checking the rest!
  }
}if (foundIndex !== -1) {
  console.log(`"${searchFor}" found at position ${foundIndex} 🎉`);
} else {
  console.log(`"${searchFor}" not in stock 😢`);
}

let day = 3;
switch (day) {
  case 1: console.log("Monday");
  break;
  // 🛑 without this, execution FALLS THROUGH!
  case 2: console.log("Tuesday");
  break;
  case 3: console.log("Wednesday");
  // ← runs
  break;
  // ← without it, Thursday runs too! 😱
  case 4: console.log("Thursday");
  break;
  default: console.log("Some other day");
}

let day = 1;
switch (day) {
  case 1: console.log("Monday");
  // 😱 forgot break!
  case 2: console.log("Tuesday");
  // 😱 forgot break!
  case 3: console.log("Wednesday");
  break;
}

MondayTuesdayWednesday

// Find a pair that sums to 10 — but break only exits the INNER loop 😬for (let i = 1; i <= 5; i++) {  for (let j = 1; j <= 5; j++) {    if (i + j === 10) {      console.log(`Found: ${i} + ${j} = 10`);      break;                      // exits inner loop only — outer continues!    }  }}

outerLoop: // 🏷️ the labelfor (let i = 1; i <= 5; i++) {  for (let j = 1; j <= 5; j++) {    if (i + j === 10) {      console.log(`Found: ${i} + ${j} = 10 🎯`);      break outerLoop;                   // exits BOTH loops!    }  }}
console.log("Search complete ✅");

Found: 5 + 5 = 10 🎯Search complete ✅

for (let i = 1;
i <= 5;
i++) {
  if (i === 3) break;
  // stops at 3  console.log(i);}// Output: 1, 2 — then loop DIES
  for (let i = 1;
  i <= 5;
  i++) {
    if (i === 3) continue;
    // skips only 3  console.log(i);}// Output: 1, 2, 4, 5 — loop COMPLETES

// 💎 Treasure Hunt — break for the win conditionlet rooms = ["empty", "cobwebs", "empty", "TREASURE", "trap", "empty"];let energy = 10;
console.log("🗺️ The hunt begins!\n");
for (let i = 0;
i < rooms.length;
i++) {
  energy--;
  // each room costs 1 energy
  if (energy <= 0) {
    console.log("😮‍💨 Out of energy — game over!");
    break;
    // exit: survival condition  }
    console.log(`Room ${i + 1}: ${rooms[i]}… (energy: ${energy})`);
    if (rooms[i] === "TREASURE") {
      console.log("💰 TREASURE FOUND! You win! 🎉");
      break;
      // exit: win condition  }
      if (rooms[i] === "trap") {
        console.log("🪤 A trap! -3 energy!");
        energy -= 3;
      }
    }console.log("\n🏁 Hunt ended.");

🗺️ The hunt begins!Room 1: empty…(energy: 9)Room 2: cobwebs…(energy: 8)Room 3: empty…(energy: 7)Room 4: TREASURE…(energy: 6)💰 TREASURE FOUND! You win! 🎉🏁 Hunt ended.