メニューを表示するにはスワイプしてください

The break keyword is a loop terminator, allowing you to exit a loop prematurely.

Example 1: Stopping an Infinite Loop


              123456789
            
let i = 1;

while (true) {
  console.log("Iteration", i);
  i++;
  if (i > 5) {
    break;
  }
}

In this example, the break keyword stops the infinite while loop when i becomes equal to 6, after the i++ operation.

Example 2: Breaking a for Loop


              123456789
            
let a = 0;

for (let i = 0; i < 10; i++) {
  a += i;
  console.log("a =", a);
  if (i > 3) {
    break;
  }
}

Here, the variable a is incremented by i during each iteration (0 + 1 + 2 + 3 + 4) until i becomes equal to 4. At that point, the break statement is triggered.

`i = 0`	`a = 0 + 0`
`i = 1`	`a = 0 + 1`
`i = 2`	`a = 1 + 2`
`i = 3`	`a = 3 + 3`
`i = 4`	`a = 6 + 4`, `break`

Example 3: Breaking a while Loop Immediately


              1234567
            
while (true) {
  console.log("Iteration start");
  break;
  console.log("Iteration end"); // This line will not be executed
}

console.log("Loop was ended");

In this example, the break statement inside the while loop immediately terminates the loop, preventing any code below it from executing within the same block.

Note

Remember that the break statement is a powerful tool for controlling the flow of your loops, allowing you to exit them when specific conditions are met.

すべて明確でしたか？

フィードバックありがとうございます！

セクション 5. 章 4

AIに質問する

何でも質問するか、提案された質問の1つを試してチャットを始めてください

Breaking Out of Loops with break