Breaking Out of Loops with break
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The break keyword is a loop terminator, allowing you to exit a loop prematurely.
Example 1: Stopping an Infinite Loop
123456789let 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
123456789let 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
1234567while (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
breakstatement is a powerful tool for controlling the flow of your loops, allowing you to exit them when specific conditions are met.
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