JavaScript: The Definitive Guide, Fourth Edition

continue

The continue statement is similar to the break statement. Instead of exiting a loop, however, continue restarts a loop in a new iteration. The continue statement’s syntax is just as simple as the break statement’s:

continue;

In ECMAScript v3 and JavaScript 1.2, the continue statement can also be used with a label:

continue labelname;

The continue statement, in both its labeled and unlabeled forms, can be used only within the body of a while, do/while, for, or for/in loop. Using it anywhere else causes a syntax error.

When the continue statement is executed, the current iteration of the enclosing loop is terminated and the next iteration begins. This means different things for different types of loops:

• In a while loop, the specified expression at the beginning of the loop is tested again, and if it’s true, the loop body is executed starting from the top.

• In a do/while loop, execution skips to the bottom of the loop, where the loop condition is tested again before restarting the loop at the top. Note, however, that JavaScript 1.2 contains a bug that causes the continue statement to jump directly to the top of a do/while loop without testing the loop condition. Therefore, if you plan to use a continue statement in a loop, you should avoid the do/while loop. This is not a serious problem, however, because you can always replace a do/while loop with an equivalent while loop.

• In a for loop, the increment expression is evaluated and the test expression is tested again to ...